Composition for preparing a release coating

ABSTRACT

A composition for forming a release coating is disclosed. The composition comprises (A) the reaction product of (1) a branched organopolysiloxane including M, D and Q siloxy units and an average of at least two silicon-bonded ethylenically unsaturated groups per molecule; and (2) an organosilicon compound having an average of at least two silicon-bonded hydrogen atoms per molecule; in the presence of a hydrosilylation catalyst. The composition further comprises (B) an organopolysiloxane having an average of at least two silicon-bonded ethylenically unsaturated groups per molecule.

CROSS REFERENCE TO RELATED APPLICATIONS

This application is the U.S. National Stage of International Application No. PCT/US2020/060406 filed on 13 Nov. 2020, which claims priority to and all advantages of U.S. Provisional Patent Application No. 62/942,685 filed on 2 Dec. 2019, the content of which is incorporated herein by reference.

TECHNICAL FIELD

The subject disclosure generally relates to a composition and, more specifically, to a composition for preparing a release coating and related methods.

BACKGROUND

Silicone compositions are known in the art and utilized in myriad industries and end use applications. One such end use application is to form release coatings or liners from which adhesives can be removed. For example, silicone compositions may be utilized to coat various substrates, such as paper, to give release liners for laminating pressure sensitive adhesives (e.g. tapes). Such silicone compositions are typically addition-curable.

Conventional release liners are typically formed by addition reacting (or hydrosilylating) an organopolysiloxane having an unsaturated hydrocarbon group and an organohydrogenpolysiloxane in the presence of a hydrosilylation reaction catalyst. In certain applications, release liners are formed at high speeds via a coating process. However, during such processes of preparing release liners, mists often form. It is desirable to minimize formation of such mists without impacting performance properties of the release liners.

BRIEF SUMMARY

A composition for forming a release coating is disclosed. The composition comprises (A) the reaction product of:

(1) a branched organopolysiloxane having the formula (R¹ _(y)R² _(3-y)SiO_(1/2))_(x)(R¹ ₂SiO_(2/2))_(z)(SiO_(4/2))_(1.0)(ZO_(1/2))_(w)

wherein each R¹ is an independently selected hydrocarbyl group having from 1 to 32 carbon atoms, with the proviso that an average of at least two of R¹ in each molecule are independently ethylenically unsaturated groups; each R² is independently selected from R¹, an alkoxy group, and a hydroxyl group; Z is independently H or an alkyl group; y is an integer from 1 to 3 and is independently selected in each siloxy unit indicated by subscript x; subscript x is from 0.05 to 4; subscript z is from 10 to 3,000; and subscript w is from 0 to 3; and

(2) an organosilicon compound having an average of at least two silicon-bonded hydrogen atoms per molecule;

in the presence of a hydrosilylation catalyst.

The composition further comprises (B) an organopolysiloxane having an average of at least two silicon-bonded ethylenically unsaturated groups per molecule.

A method of preparing the composition is also disclosed. In addition, a method of preparing a coated substrate comprising a release coating disposed on a substrate, as well as the coated substrate formed in accordance with the method, are disclosed.

DETAILED DESCRIPTION OF THE INVENTION

A composition for forming a release coating is disclosed. The composition comprises (A) the reaction product of: (1) a branched organopolysiloxane; and (2) an organosilicon compound having an average of at least two silicon-bonded hydrogen atoms per molecule; in the presence of a hydrosilylation catalyst.

The (A)(1) branched organopolysiloxane having the formula: (R¹ _(y)R² _(3-y)SiO_(1/2))_(x)(R¹ ₂SiO_(2/2))_(z)(SiO_(4/2))_(1.0)(ZO_(1/2))_(w)

wherein each R¹ is an independently selected hydrocarbyl group having from 1 to 32 carbon atoms, with the proviso that an average of at least two of R¹ in each molecule are independently ethylenically unsaturated groups; each R² is independently selected from R¹, an alkoxy group, and a hydroxyl group; Z is independently H or an alkyl group; y is an integer from 1 to 3 and is independently selected in each siloxy unit indicated by subscript x; subscript x is from 0.05 to 4; subscript z is from 10 to 3,000; and subscript w is from 0 to 3.

In general, hydrocarbyl groups suitable for R¹ may independently be linear, branched, cyclic, or combinations thereof. Cyclic hydrocarbyl groups encompass aryl groups as well as saturated or non-conjugated cyclic groups. Cyclic hydrocarbyl groups may independently be monocyclic or polycyclic. Linear and branched hydrocarbyl groups may independently be saturated or unsaturated. One example of a combination of a linear and cyclic hydrocarbyl group is an aralkyl group. General examples of hydrocarbyl groups include alkyl groups, aryl groups, alkenyl groups, halocarbon groups, and the like, as well as derivatives, modifications, and combinations thereof. Examples of suitable alkyl groups include methyl, ethyl, propyl (e.g. iso-propyl and/or n-propyl), butyl (e.g. isobutyl, n-butyl, tert-butyl, and/or sec-butyl), pentyl (e.g. isopentyl, neopentyl, and/or tert-pentyl), hexyl, hexadecyl, octadecyl as well as branched saturated hydrocarbon groups having from 6 to 18 carbon atoms. Examples of suitable non-conjugated cyclic groups include cyclobutyl, cyclohexyl, and cycloheptyl groups. Examples of suitable aryl groups include phenyl, tolyl, xylyl, naphthyl, benzyl, and dimethyl phenyl. Examples of suitable alkenyl groups include vinyl, allyl, propenyl, isopropenyl, butenyl, isobutenyl, pentenyl, heptenyl, hexenyl, octenyl, hexadecenyl, octadecenyl and cyclohexenyl groups. Examples of suitable monovalent halogenated hydrocarbon groups (i.e., halocarbon groups) include halogenated alkyl groups, aryl groups, and combinations thereof. Examples of halogenated alkyl groups include the alkyl groups described above where one or more hydrogen atoms is replaced with a halogen atom such as F or Cl. Specific examples of halogenated alkyl groups include fluoromethyl, 2-fluoropropyl, 3,3,3-trifluoropropyl, 4,4,4-trifluorobutyl, 4,4,4,3,3-pentafluorobutyl, 5,5,5,4,4,3,3-heptafluoropentyl, 6,6,6,5,5,4,4,3,3-nonafluorohexyl, and 8,8,8,7,7-pentafluorooctyl, 2,2-difluorocyclopropyl, 2,3-difluorocyclobutyl, 3,4-difluorocyclohexyl, and 3,4-difluoro-5-methylcycloheptyl, chloromethyl, chloropropyl, 2-dichlorocyclopropyl, and 2,3-dichlorocyclopentyl groups, as well as derivatives thereof. Examples of halogenated aryl groups include the aryl groups described above where one or more hydrogen atoms is replaced with a halogen atom, such as F or Cl. Specific examples of halogenated aryl groups include chlorobenzyl and fluorobenzyl groups.

In specific embodiments, each R¹ is independently selected from alkyl groups having from 1 to 32, alternatively from 1 to 28, alternatively from 1 to 24, alternatively from 1 to 20, alternatively from 1 to 16, alternatively from 1 to 12, alternatively from 1 to 8, alternatively from 1 to 4, alternatively 1, carbon atoms, and from ethylenically unsaturated (i.e., alkenyl and/or alkynyl groups) groups having from 2 to 32, alternatively from 2 to 28, alternatively from 2 to 24, alternatively from 2 to 20, alternatively from 2 to 16, alternatively from 2 to 12, alternatively from 2 to 8, alternatively from 2 to 4, alternatively 2, carbon atoms. “Alkenyl” means an acyclic, branched or unbranched, monovalent hydrocarbon group having one or more carbon-carbon double bonds. Specific examples thereof include vinyl groups, allyl groups, hexenyl groups, and octenyl groups. “Alkynyl” means an acyclic, branched or unbranched, monovalent hydrocarbon group having one or more carbon-carbon triple bonds. Specific examples thereof include ethynyl, propynyl, and butynyl groups. Various examples of ethylenically unsaturated groups include CH₂═CH—, CH₂═CHCH₂—, CH₂═CH(CH₂)₄—, CH₂═CH(CH₂)₆—, CH₂═C(CH₃)CH₂—, H₂C═C(CH₃)—, H₂C═C(CH₃)—, H₂C═C(CH₃)CH₂—, H₂C═CHCH₂CH₂—, H₂C═CHCH₂CH₂CH₂—, HC≡C—, HC≡CCH₂—, HC≡CCH(CH₃)—, HC≡CC(CH₃)₂—, and HC≡CC(CH₃)₂CH₂—. Typically, when R¹ is an ethylenically unsaturated group, the ethylenic unsaturation is terminal in R¹. As understood in the art, ethylenic unsaturation may be referred to as aliphatic unsaturation. In the (A)(1) branched organopolysiloxane, an average of at least two of R¹ in each molecule are independently ethylenically unsaturated groups.

In specific embodiments, each R¹ in the (A)(1) branched organopolysiloxane, other than those R¹ that are ethylenically unsaturated groups is an independently selected alkyl group. When at least two of R¹ in the (A)(1) branched organopolysiloxane is a vinyl group (as the ethylenically unsaturated group), each of the remaining R¹ are methyl groups, and when subscript y is 3, the (A)(1) branched organopolysiloxane can include any combination of the following M siloxy units, as long as at least one M siloxy unit including a silicon-bonded vinyl group is present: ((CH₃)₃SiO_(1/2)), ((CH₃)₂(CH═CH₂)SiO_(1/2)), ((CH₃)(CH═CH₂)₂SiO_(1/2)), and ((CH═CH₂)₃SiO_(1/2)). It is to be understood that the above examples are exemplary only, and any methyl group may be replaced with any other alkyl or even hydrocarbyl group, and any vinyl group may be replaced with any other alkenyl or ethylenically unsaturated group.

R² is independently selected from R¹, an alkoxy group, and a hydroxyl group. Typically, each R² is independently selected from R¹. However, as understood in the art, the (A)(1) branched organopolysiloxane may inherently include some amount of silicon-bonded hydroxyl and/or alkoxy groups resulting from formation of the (A)(1) branched organopolysiloxane, which is typically obtained via cohydrolysis/condensation. Thus, one or more of R² may be an alkoxy group or a hydroxyl group, even though such alkoxy groups or hydroxyl groups are typically not intentionally included in the (A)(1) branched organopolysiloxane. In addition, for purposes of this disclosure and the average formula above, siloxy units including silicon-bonded hydroxyl groups that are not fully condensed or capped may be considered Q siloxy units (so long as the silicon atom including silicon-bonded hydroxyl group(s) does not include any silicon-carbon bond). Such silicon-bonded hydroxyl groups can condense to result in Q siloxy units. The (A)(1) branched organopolysiloxane may include, in certain embodiments, up to 4, alternatively up to 3, alternatively up to 2, weight percent of hydroxyl groups.

Subscript y is an integer from 0 to 3, alternatively from 1 to 3, alternatively from 2 to 3, alternatively 3. In addition, subscript y is independently selected in each M siloxy unit indicated by subscript x. Thus, the (A)(1) branched organopolysiloxane could include, for example, M siloxy units represented by (R¹ ₃SiO_(1/2)), when y is 3, and (R¹ ₂R²SiO_(1/2)), when y is 2. Typically, a majority, i.e., at least 50, alternatively at least 60, alternatively at least 70, alternatively at least 80, alternatively at least 90, alternatively at least 95, mole % of all M siloxy units in the (A)(1) branched organopolysiloxane are represented by (R¹ ₃SiO_(1/2)). All M siloxy units in the (A)(1) branched organopolysiloxane are aggregated for purposes of subscript x, defined above.

In various embodiments, subscript x is from 0.05 to 0.99, alternatively from 0.10 to 0.95, alternatively from 0.15 to 0.90, alternatively from 0.20 to 0.85, alternatively from 0.25 to 0.80, alternatively from 0.30 to 0.75. In specific embodiments, subscript x is from 0.50 to 0.80, alternatively from 0.55 to 0.75, alternatively from 0.60 to 0.75, alternatively from 0.65 to 0.75, alternatively from 0.70 to 0.75. In another specific embodiment, subscript x is from 0.05 to 0.85. In yet another specific embodiment, subscript x is from 0.40 to 0.90, alternatively from 0.70 to 0.85. Alternatively, subscript x may be greater than 1. For example, in other embodiments, subscript x is from 1.05 to 4, alternatively from 1.05 to 3, alternatively from 1.05 to 2.5.

Subscript w is from 0 to 3, alternatively from 0 to 2, alternatively from 0 to 1, alternatively from 0 to 0.9, alternatively from 0 to 0.8, alternatively from 0 to 0.7, alternatively from 0 to 0.6, alternatively from 0 to 0.5, alternatively from 0 to 0.4, alternatively from 0 to 0.3, alternatively from 0 to 0.2, alternatively from 0 to 0.1, and represents the SiOZ content of the (A1) branched organopolysiloxane. SiOZ content can be SiOH (where Z is H, or a silanol group), or silicon-bonded alkoxy (where Z is alkyl). For example, “(SiO_(4/2))(ZO_(1/2))” refers to a Q-type group with a silicon atom bound through a single oxygen to a “Z” group. Under NMR nomenclature, such “(SiO_(4/2))(ZO_(1/2))” moieties are still considered Q siloxy units. When Z is an alkyl group, the alkyl group is typically a C1-C8, alternatively a C1-C6, alternatively a C1-C4, alternatively a C1-C2, alternatively a C1 (i.e., methyl) alkyl group. When such moieties are considered Q units, the (A)(1) branched organopolysiloxane can be represented by formula (R¹ _(y)R² _(3-y)SiO_(1/2))_(x)(R¹ ₂SiO_(2/2))_(z)(SiO_(4/2)).

The D siloxy units, i.e., (R¹ ₂SiO_(2/2)) units, are typically formed from ring-opening of a cyclic siloxane and polymerization, as described below. Typically, the D siloxy units are present between Q siloxy units and M siloxy units, rather than being between two Q siloxy units. The number of D siloxy units present between each particular Q and M siloxy unit in any given linear siloxane moiety may vary in each case. The formula above represents all D units present in the (A)(1) branched organopolysiloxane without regard to their location in the (A)(1) branched organopolysiloxane. In certain embodiments, not every Q siloxy unit in the (A)(1) branched organopolysiloxane is bonded to a D siloxy unit. Instead, a number of Q siloxy units can be clustered in the (A)(1) branched organopolysiloxane.

In certain embodiments, z is from 10 to 3,000, alternatively from 10 to 2,000, alternatively from 10 to 1,000, alternatively from 10 to 750, alternatively from 10 to 500, alternatively from 50 to 500, alternatively from 100 to 500, alternatively from 110 to 475, alternatively from 120 to 450, alternatively from 130 to 425, alternatively from 140 to 400, alternatively from 150 to 375, alternatively from 160 to 350, alternatively from 170 to 325, alternatively from 180 to 300, alternatively from 190 to 275, alternatively from 200 to 250. In other embodiments, z is from 10 to 3,000, alternatively from 250 to 2,500, alternatively from 500 to 1,000.

Subscripts x and z are normalized based on the number of Q siloxy units present in the (A)(1) branched organopolysiloxane. Thus, subscripts x and z are molar ratios relative to Q siloxy unit content. For example, when subscript x is less than 1, there are fewer M siloxy units than Q siloxy units in the (A)(1) branched organopolysiloxane. The fact that the formula for the (A)(1) branched organopolysiloxane normalizes the content of Q siloxy units to 1 does not imply that the ((A)(1) branched organopolysiloxane includes only one Q unit. The (A)(1) branched organopolysiloxane may include, and typically does include, a plurality of Q siloxy units clustered or bonded together.

In certain embodiments, the (A)(1) branched organopolysiloxane is the reaction product of:

(i) a silicone resin having the formula (R¹ _(y)R² _(3-y)SiO_(1/2))_(x)(SiO_(4/2))_(1.0)(ZO_(1/2))_(w), wherein each R¹ is an independently selected and defined above; each R² is independently selected and defined above; each Z is independently selected and defined above; y is independently selected in each siloxy unit indicated by subscript x and defined above; subscript x is defined above; and subscript w is defined above; and

(ii) a cyclic siloxane having the formula (R¹ ₂SiO_(2/2))_(n), where each R¹ is independently a hydrocarbyl group, and n is an integer from 3 to 15;

in the presence of a polymerization catalyst.

The (i) silicone resin may alternatively be referred to as an MQ resin, where M designates (R⁰ ₃SiO_(1/2)) siloxy units, and Q designates (SiO_(4/2)) siloxy units, where R⁰ designates a silicon-bonded substituent. Such MQ resins are known in the art and are often in solid (e.g. powder or flake) form unless disposed in a solvent. The (i) silicone resin has the average formula (R¹ _(y)R² _(3-y)SiO_(1/2))_(x)(SiO_(4/2))_(1.0)(ZO_(1/2))_(w), which can alternatively be recited as [M]_(x)[Q]. However, typically in the nomenclature utilized in the art, M siloxy units are trimethylsiloxy units, whereas R¹ and R² in the (i) silicone resin need not be methyl groups. In the (i) silicone resin, subscript x refers to the molar ratio of M siloxy units to Q siloxy units when the number of moles of Q siloxy units is normalized to 1. The greater the value of x, the lesser the crosslink density of the (i) silicone resin. The inverse is also true, because as the value of x decreases, the number of M siloxy units decreases, and thus more Q siloxy units are networked without termination via an M siloxy unit. The fact that the formula for the (i) silicone resin normalizes the content of Q siloxy units to 1 does not imply that the (i) silicone resin includes only one Q unit. The (i) silicone resin may include a plurality of Q siloxy units clustered or bonded together. In addition, for purposes of this disclosure and the average formula above, siloxy units including silicon-bonded hydroxyl groups that are not fully condensed or capped may be considered Q siloxy units (so long as the silicon atom including silicon-bonded hydroxyl group(s) does not include any silicon-carbon bond). Such silicon-bonded hydroxyl groups can condense to result in Q siloxy units. Thus, even after bodying the (i) silicone resin, as described below, the value of subscript x, and the ratio of M to Q siloxy units, remains the same after further condensation of any residual silicon-bonded hydroxyl groups present in Q siloxy units. For example, the (i) silicone resin may include, in certain embodiments, up to 4, alternatively up to 3, alternatively up to 2, weight percent of hydroxyl groups. The (i) silicone resin may include a higher level of SiOZ content than the resulting (A1) branched organopolysiloxane.

Subscript y is an integer from 0 to 3, alternatively from 1 to 3, alternatively from 2 to 3, alternatively 3. In addition, subscript y is independently selected in each M siloxy unit indicated by subscript x. Thus, the (i) silicone resin could include, for example, M siloxy units represented by (R¹ ₃SiO_(1/2)), when y is 3, and (R¹ ₂R²SiO_(1/2)), when y is 2. Typically, a majority, i.e., at least 50, alternatively at least 60, alternatively at least 70, alternatively at least 80, alternatively at least 90, alternatively at least 95, mole % of all M siloxy units in the (i) silicone resin are represented by (R¹ ₃SiO_(1/2)). All M siloxy units in the (i) silicone resin are aggregated for purposes of subscript x, defined above.

In specific embodiments, the (A)(1) branched organopolysiloxane is the reaction product of the (i) silicone resin and (ii) a cyclic siloxane having the formula (R¹ ₂SiO_(2/2))_(n), where R¹ is defined above and n is an integer from 3 to 15. In the cyclic siloxane, each R¹ is typically an independently selected alkyl group, and most typically, each R¹ is a methyl group. When each R¹ is a methyl group, the (ii) cyclic siloxane may be referred to based on n. For example, when n is 3, the (ii) cyclic siloxane is referred to as D3; when n is 4, the (ii) cyclic siloxane is referred to as D4; when n is 5, the (ii) cyclic siloxane is referred to as D5; etc. In other embodiments, however, at least one R¹ of the (ii) cyclic siloxane is a silicon-bonded ethylenically unsaturated group, i.e., a silicon bonded alkenyl or alkynyl group. For example, when at least one R¹ of the (ii) cyclic siloxane is a silicon-bonded ethylenically unsaturated group, the (ii) cyclic siloxane may comprise, for example, methylvinylsiloxy units, or divinylsiloxy units. Each D siloxy unit of the (ii) cyclic siloxane is independently selected such that methylvinylsiloxy units may be present in combination with dimethylsiloxy units.

Subscript n is from 3 to 15, alternatively from 3 to 12, alternatively from 3 to 10, alternatively from 3 to 8, alternatively from 3 to 6, alternatively from 4-5. In addition, the (ii) cyclic siloxane may comprise a blend of different cyclic siloxanes, e.g. a blend of those where n is 4 and where n is 5. In specific embodiments, the (ii) cyclic siloxane is selected from the group of cyclotrisiloxanes, cyclotetrasiloxanes such as octamethylcyclotetrasiloxane, cyclopentasiloxanes such as decamethylcyclopentasiloxane, cyclohexasiloxanes, and combinations thereof. For descriptive purposes only, chemical structures of decamethylcyclopentasiloxane and octamethylcyclotetrasiloxane are shown below:

The (ii) cyclic siloxane typically has a molecular weight from 100 to 750, alternatively from 150 to 500, and alternatively from 275 to 375, g/mol.

The (i) silicone resin and the (ii) cyclic siloxane are reacted in the presence of a polymerization catalyst. Typically, the polymerization catalyst is an acid or a base such that the reaction between the (i) silicone resin and the (ii) cyclic siloxane is either an acid catalyzed or a base catalyzed reaction. As such, in certain embodiments, the polymerization catalyst may be selected from the group of strong acid catalysts, strong base catalysts, and combinations thereof. The strong acid catalyst may be trifluoromethane sulfonic acid and the like. The polymerization catalyst is typically a strong base catalyst. Typically, this strong base catalyst is a phosphazene catalyst, although other strong base catalysts, such as KOH, can be utilized in lieu of the phosphazene base catalyst.

The phosphazene catalyst, which generally includes at least one —(N═P<)— unit (i.e., a phosphazene unit) and is usually an oligomer having up to 10 such phosphazene units, for example having an average of from 1.5 up to 5 phosphazene units. The phosphazene catalyst may be, for example, a halophosphazene, such as a chlorophosphazene (phosphonitrile chloride), an oxygen-containing halophosphazene, an ionic derivative of a phosphazene such as a phosphazenium salt, particularly an ionic derivative of a phosphonitrile halide such as a perchlorooligophosphazenium salt, or a partially hydrolyzed form thereof.

In specific embodiments, the polymerization catalyst comprises a phosphazene base catalyst. The phosphazene base catalyst may be any known in the art but typically has the following chemical formula: ((R³ ₂N)₃P═N)_(t)(R³ ₂N)_(3-t)P═NR³ wherein each R³ is independently selected from the group of a hydrogen atom, R¹, and combinations thereof, and t is an integer from 1 to 3. If R³ is a R¹, then R³ is typically an alkyl group having from 1 to 20, alternatively from 1 to 10, alternatively from 1 to 4, carbon atoms. The two R³ groups in the any (R³ ₂N) moiety may be bonded to the same nitrogen (N) atom and linked to complete a heterocyclic ring preferably having 5 or 6 members.

Alternatively, the phosphazene base catalyst may be a salt and have one of the following alternative chemical formulas: [((R³ ₂N)₃P═N)_(t)(R³ ₂N)_(3-t)P═N(H)R³]⁺[A⁻]; or [((R³ ₂N)₃P═N)_(s)(R³ ₂N)_(4-s)P]⁺[A⁻] wherein each R³ is independently selected and defined above, subscript t is defined above, subscript s is an integer from 1 to 4, and [A] is an anion and is typically selected from the group of fluoride, hydroxide, silanolate, alkoxide, carbonate and bicarbonate. In one embodiment, the phosphazene base is an aminophosphazenium hydroxide.

The reaction of the (i) silicone resin and the (ii) cyclic siloxane in the presence of the polymerization catalyst results in ring-opening of the (ii) cyclic siloxane and incorporation of D siloxy units into the (A)(1) branched organopolysiloxane. The relative amounts of the (i) silicone resin and the (ii) cyclic siloxane utilized are a function of the desired content of D siloxy units in the (A)(1) branched organopolysiloxane, which is described below. The number of D siloxy units in the (A)(1) branched organopolysiloxane may be referred to as the degree of polymerization (DP) of the (A)(1) branched organopolysiloxane, although the (A)(1) branched organopolysiloxane includes branching attributable to the Q siloxy units and is not linear.

In certain embodiments, the (i) silicone resin and the (ii) cyclic siloxane are reacted at an elevated temperature, e.g. from 125 to 175° C., in the presence of a solvent. Suitable solvents may be hydrocarbons. Suitable hydrocarbons include aromatic hydrocarbons such as benzene, toluene, or xylene; and/or aliphatic hydrocarbons such as heptane, hexane, or octane. Alternatively, the solvent may be a halogenated hydrocarbon such as dichloromethane, 1,1,1-trichloroethane or methylene chloride. A complexing agent, such as bis(trimethylsilyl)hydrogen phosphate may be utilized after the reaction to inhibit the activity of the polymerization catalyst. One of skill in the art can readily determine a catalytic quantity of the polymerization catalyst to be utilized, which is a function of its selection and reaction conditions.

The (i) silicone resin may optionally be bodied prior to reacting the (i) silicone resin and the (ii) cyclic siloxane. As understood in the art, bodying a silicone resin typically results in an increase of molecular weight through further condensation of any residual silicon-bonded hydroxy groups that may be present in the silicone resin from its formation. Bodying the (i) silicone resin typically comprises heating the (i) silicone resin at an elevated temperature, generally while the (i) silicone resin is disposed in a solvent. Suitable solvents are disclosed above. Bodying of the (i) silicone resin results in water as a byproduct from condensation of silanol groups.

As introduced above, the (A) reaction product is of (1) the branched organopolysiloxane; and (2) an organosilicon compound having an average of at least two silicon-bonded hydrogen atoms per molecule, in the presence of a hydrosilylation catalyst. The (A)(2) organosilicon compound may be linear, branched, partly branched, cyclic, resinous (i.e., have a three-dimensional network), or may comprise a combination of different structures. The (A)(2) organosilicon compound is typically a cross-linker, and reacts with the ethylenically unsaturated groups of the (A)(1) branched organopolysiloxane. Typically, the (A)(2) organosilicon compound comprises an organohydrogensiloxane.

The (A)(2) organosilicon compound may comprise any combination of M, D, T and/or Q siloxy units, so long as the (A)(2) organosilicon compound includes at least two silicon-bonded hydrogen atoms per molecule. These siloxy units can be combined in various manners to form cyclic, linear, branched and/or resinous (three-dimensional networked) structures. The (A)(2) organosilicon compound may be monomeric, polymeric, oligomeric, linear, branched, cyclic, and/or resinous depending on the selection of M, D, T, and/or Q units.

Because the (A)(2) organosilicon compound includes an average of at least two silicon-bonded hydrogen atoms per molecule, with reference to the siloxy units set forth above, the (A)(2) organosilicon compound may comprise any of the following siloxy units including silicon-bonded hydrogen atoms, optionally in combination with siloxy units which do not include any silicon-bonded hydrogen atoms: (R¹ ₂HSiO_(1/2)), (R¹H₂SiO_(1/2)), (H₃SiO_(1/2)), (R¹HSiO_(2/2)), (H₂SiO_(2/2)), and/or (HSiO_(3/2)), where R¹ is independently selected and defined above.

In specific embodiments, the (A)(2) organosilicon compound is a substantially linear, alternatively linear, polyorganohydrogensiloxane. The substantially linear or linear polyorganohydrogensiloxane has unit formula: (HR¹⁰ ₂SiO_(1/2))_(v′)(HR¹⁰SiO_(2/2))_(w′)(R¹⁰ ₂SiO_(2/2))_(x′)(R¹⁰ ₃SiO_(1/2))_(y′), where each R¹⁰ is an independently selected monovalent hydrocarbon group, subscript v′ is 0, 1, or 2, subscript w′ is 1 or more, subscript x′ is 0 or more, subscript y′ is 0, 1, or 2, with the provisos that a quantity (v′+y′)=2, and a quantity (v′+w′)≥3. The monovalent hydrocarbon group for R¹⁰ may be as described above for the monovalent hydrocarbon group for R¹. A quantity (v′+w′+x′+y′) may be 2 to 1,000. The polyorganohydrogensiloxane is exemplified by:

-   i) dimethylhydrogensiloxy-terminated     poly(dimethyl/methylhydrogen)siloxane copolymer, -   ii) dimethylhydrogensiloxy-terminated polymethylhydrogensiloxane, -   iii) trimethylsiloxy-terminated     poly(dimethyl/methylhydrogen)siloxane copolymer, -   iv) trimethylsiloxy-terminated polymethylhydrogensiloxane, and/or -   v) a combination of two or more of i), ii), iii), iv), and v).     Suitable polyorganohydrogensiloxanes are commercially available from     Dow Silicones Corporation of Midland, Mich., USA.

In one specific embodiment, the (A)(2) organosilicon compound is linear and includes pendent silicon-bonded hydrogen atoms. In these embodiments, the (A)(2) organosilicon compound may be a dimethyl, methyl-hydrogen polysiloxane having the average formula; (CH₃)₃SiO[(CH₃)₂SiO]_(x′)[(CH₃)HSiO]_(w′)Si(CH₃)₃ where x′ and w′ are defined above. One of skill in the art understands that in the exemplary formula above the dimethylsiloxy units and methylhydrogensiloxy units may be present in randomized or block form, and that any methyl group may be replaced with any other hydrocarbon group free of aliphatic unsaturation.

In another specific embodiment, the (A)(2) organosilicon compound is linear and includes terminal silicon-bonded hydrogen atoms. In these embodiments, the (A)(2) organosilicon compound may be an SiH terminal dimethyl polysiloxane having the average formula: H(CH₃)₂SiO[CH₃)₂SiO]_(x′)Si(CH₃)₂H where x′ is as defined above. The SiH terminal dimethyl polysiloxane may be utilized alone or in combination with the dimethyl, methyl-hydrogen polysiloxane disclosed immediately above. When a mixture is utilized, the relative amount of each organohydrogensiloxane in the mixture may vary. One of skill in the art understands that any methyl group in the exemplary formula above may be replaced with any other hydrocarbon group free of aliphatic unsaturation.

Alternatively still, the (A)(2) organosilicon compound may include both pendent and terminal silicon-bonded hydrogen atoms.

In certain embodiments, the (A)(2) organosilicon compound may comprise an alkyl hydrogen cyclosiloxane or an alkyl hydrogen dialkyl cyclosiloxane copolymer. Specific examples of suitable organohydrogensiloxanes of this type include (OSiMeH)₄, (OSiMeH)₃(OSiMeC₆H₁₃), (OSiMeH)₂(OSiMeC₆H₁₃)₂, and (OSiMeH)(OSiMeC₆H₁₃)₃, where Me represents methyl (—CH₃).

In these or other embodiments, the (A)(2) organosilicon compound may comprise an organopolysiloxane having both cyclic and linear moieties. In such embodiments, the silicon-bonded hydrogen atoms of the (A)(2) organosilicon compound may be present in the cyclic moiety, the linear moiety, or both. One exemplary example of such an organopolysiloxane is a dumbbell-shaped organopolysiloxane having the following formula:

where subscript n is from 2 to 2,000 and each subscript o is independently from 1 to 10. Such dumbbell-shaped organopolysiloxanes can be prepared through reacting a linear hydroxyl terminated polydiorganosiloxane having a DP of from 2 to 2,000 and a cyclic polyorganohydrogensiloxane in the presence of a boron containing Lewis acid. Such preparation methods are disclosed in, for example, PCT/US2019/064350.

In these or other embodiments, the (A)(2) organosilicon compound may comprise a silicone resin. In such embodiments, the (A)(2) organosilicon compound typically comprises T and/or Q siloxy units, which may optionally be in combination with M and/or D siloxy units. In such embodiments, the silicon-bonded hydrogen atoms may be present in the M, D, and/or T siloxy units.

One specific example of a silicone resin suitable for the (A)(2) organosilicon compound is a silsesquioxane, or T resin. For example, the silsesquioxane may have formula T^(H), or HSiO_(3/2). The silsesquioxane may also include T siloxy units that do not include silicon-bonded hydrogen atoms, e.g. CH₃SiO_(3/2) units. Silsesquioxanes are known in the art and commercially available from various suppliers.

Another example of a silicone resin suitable for the (A)(2) organosilicon compound is an MQ resin. As understood in the art, MQ resins include M and Q siloxy units. In these embodiments, the silicon-bonded hydrogen atoms are present in M siloxy units. The M siloxy units may include any combination of (R¹ ₂HSiO_(1/2)), (R¹H₂SiO_(1/2)), and (H₃SiO_(1/2)), where R¹ is independently selected and defined above, so long as the MQ resin includes at least two silicon-bonded hydrogen atoms.

Other examples of suitable organohydrogensiloxanes for the (A)(2) organosilicon compound are those having at least two SiH containing cyclosiloxane rings in one molecule. Such an organohydrogensiloxane may be any organopolysiloxane having at least two cyclosiloxane rings with at least one silicon-bonded hydrogen (SiH) atom on each siloxane ring. Cyclosiloxane rings contain at least three siloxy units (that is, the minimum needed in order to form a siloxane ring), and may be any combination of M, D, T, and/or Q siloxy units that forms a cyclic structure, provided that at least one of the cyclic siloxy units on each siloxane ring contains one SiH unit, which may be an M siloxy unit, a D siloxy unit, and/or a T siloxy unit. These siloxy units can be represented as MH, DH, and TH siloxy units respectively when other substituents are methyl.

In specific embodiments, the (A)(2) organosilicon compound has the formula H_(y′)R¹ _(3-y′)Si—(OSiR¹ ₂)_(m)—(OSiR¹H)_(m′)—OSiR¹ _(3-y′)H_(y′), where each R¹ is independently selected and defined above, each y′ is independently selected from 0 or 1, subscripts m and m′ are each from 0 to 1,000 with the proviso that m and m′ are not simultaneously 0 and m+m′ is from 1 to 1,000. In even more specific embodiments, each R¹ is methyl, each y′ is 1, m′ is 0, and m is from 1 to 1,000, alternatively from 1 to 500, alternatively from 1 to 250.

The (A)(2) organosilicon compound may comprise a combination or two or more different organohydrogensiloxanes that differ in at least one property such as structure, molecular weight, monovalent groups bonded to silicon atoms and content of silicon-bonded hydrogen atoms. The composition may comprise the (A)(2) organosilicon compound in an amount to give a molar ratio of silicon-bonded ethylenically unsaturated groups in component (A)(1) to silicon-bonded hydrogen atoms in component (A)(2) in an amount of from 1:1 to 30:1, alternatively from 2:1 to 20:1, alternatively from 3:1 to 10:1, alternatively from 3:1 to 7:1, alternatively from 3:1 to 5:1, alternatively from 2:1 to 10:1, alternatively from 2:1 to 7:1, alternatively from 2:1 to 5:1, alternatively from 2:1 to 4:1. Typically, the (A)(2) organosilicon compound is selected to crosslink the (A)(1) branched organopolysiloxane, and is a linear organohydrogensiloxane having terminal silicon-bonded hydrogen atoms. Typically, there is a molar excess of silicon-bonded ethylenically unsaturated groups in component (A)(1) to silicon-bonded hydrogen atoms in component (A)(2) such that the (A) reaction product is only partially crosslinked, not fully crosslinked.

The hydrosilylation-reaction catalyst is not limited and may be any known hydrosilylation-reaction catalyst for catalyzing hydrosilylation reactions. Combinations of different hydrosilylation-reaction catalysts may be utilized.

In certain embodiments, the hydrosilylation-reaction catalyst comprises a Group VIII to Group XI transition metal. Group VIII to Group XI transition metals refer to the modern IUPAC nomenclature. Group VIII transition metals are iron (Fe), ruthenium (Ru), osmium (Os), and hassium (Hs); Group IX transition metals are cobalt (Co), rhodium (Rh), and iridium (Ir); Group X transition metals are nickel (Ni), palladium (Pd), and platinum (Pt); and Group XI transition metals are copper (Cu), silver (Ag), and gold (Au). Combinations thereof, complexes thereof (e.g. organometallic complexes), and other forms of such metals may be utilized as the hydrosilylation-reaction catalyst.

Additional examples of catalysts suitable for the hydrosilylation-reaction catalyst include rhenium (Re), molybdenum (Mo), Group IV transition metals (i.e., titanium (Ti), zirconium (Zr), and/or hafnium (Hf)), lanthanides, actinides, and Group I and II metal complexes (e.g. those comprising calcium (Ca), potassium (K), strontium (Sr), etc.). Combinations thereof, complexes thereof (e.g. organometallic complexes), and other forms of such metals may be utilized as the hydrosilylation-reaction catalyst.

The hydrosilylation-reaction catalyst may be in any suitable form. For example, the hydrosilylation-reaction catalyst may be a solid, examples of which include platinum-based catalysts, palladium-based catalysts, and similar noble metal-based catalysts, and also nickel-based catalysts. Specific examples thereof include nickel, palladium, platinum, rhodium, cobalt, and similar elements, and also platinum-palladium, nickel-copper-chromium, nickel-copper-zinc, nickel-tungsten, nickel-molybdenum, and similar catalysts comprising combinations of a plurality of metals. Additional examples of solid catalysts include Cu—Cr, Cu—Zn, Cu—Si, Cu—Fe—Al, Cu—Zn—Ti, and similar copper-containing catalysts, and the like.

The hydrosilylation-reaction catalyst may be in or on a solid carrier. Examples of carriers include activated carbons, silicas, silica aluminas, aluminas, zeolites and other inorganic powders/particles (e.g. sodium sulphate), and the like. The hydrosilylation-reaction catalyst may also be disposed in a vehicle, e.g. a solvent which solubilizes the hydrosilylation-reaction catalyst, alternatively a vehicle which merely carries, but does not solubilize, the hydrosilylation-reaction catalyst. Such vehicles are known in the art.

In specific embodiments, the hydrosilylation-reaction catalyst comprises platinum. In these embodiments, the hydrosilylation-reaction catalyst is exemplified by, for example, platinum black, compounds such as chloroplatinic acid, chloroplatinic acid hexahydrate, a reaction product of chloroplatinic acid and a monohydric alcohol, platinum bis(ethylacetoacetate), platinum bis(acetylacetonate), platinum chloride, and complexes of such compounds with olefins or organopolysiloxanes, as well as platinum compounds microencapsulated in a matrix or core-shell type compounds. Microencapsulated hydrosilylation catalysts and methods of their preparation are also known in the art, as exemplified in U.S. Pat. Nos. 4,766,176 and 5,017,654, which are incorporated by reference herein in their entireties.

Complexes of platinum with organopolysiloxanes suitable for use as the hydrosilylation-reaction catalyst include 1,3-diethenyl-1,1,3,3-tetramethyldisiloxane complexes with platinum. These complexes may be microencapsulated in a resin matrix. Alternatively, the hydrosilylation-reaction catalyst may comprise 1,3-diethenyl-1,1,3,3-tetramethyldisiloxane complex with platinum. The hydrosilylation-reaction catalyst may be prepared by a method comprising reacting chloroplatinic acid with an aliphatically unsaturated organosilicon compound such as divinyltetramethyldisiloxane, or alkene-platinum-silyl complexes.

The hydrosilylation-reaction catalyst may also, or alternatively, be a photoactivatable hydrosilylation-reaction catalyst, which may initiate curing via irradiation and/or heat. The photoactivatable hydrosilylation-reaction catalyst can be any hydrosilylation-reaction catalyst capable of catalyzing the hydrosilylation reaction, particularly upon exposure to radiation having a wavelength of from 150 to 800 nanometers (nm).

Specific examples of photoactivatable hydrosilylation-reaction catalysts suitable for the hydrosilylation-reaction catalyst include, but are not limited to, platinum(II) β-diketonate complexes such as platinum(II) bis(2,4-pentanedioate), platinum(II) bis(2,4-hexanedioate), platinum(II) bis(2,4-heptanedioate), platinum(II) bis(1-phenyl-1,3-butanedioate, platinum(II) bis(1,3-diphenyl-1,3-propanedioate), platinum(II) bis(1,1,1,5,5,5-hexafluoro-2,4-pentanedioate); (η-cyclopentadienyl)trialkylplatinum complexes, such as (Cp)trimethylplatinum, (Cp)ethyldimethylplatinum, (Cp)triethylplatinum, (chloro-Cp)trimethylplatinum, and (trimethylsilyl-Cp)trimethylplatinum, where Cp represents cyclopentadienyl; triazene oxide-transition metal complexes, such as Pt[C₆H₅NNNOCH₃]₄, Pt[p-CN—C₆H₄NNNOC₆H₁₁]₄, Pt[p-H₃COC₆H₄NNNOC₆H₁₁]₄, Pt[p-CH₃(CH₂)_(x)—C₆H₄NNNOCH₃]₄, 1,5-cyclooctadiene.Pt[p-CN—C₆H₄NNNOC₆H₁₁]₂, 1,5-cyclooctadiene.Pt[p-CH₃O—C₆H₄NNNOCH₃]₂, [(C₆H₅)₃P]₃Rh[p-CN—C₆H₄NNNOC₆H₁₁], and Pd[p-CH₃(CH₂)_(x)—C₆H₄NNNOCH₃]₂, where x is 1, 3, 5, 11, or 17; (η-diolefin)(σ-aryl)platinum complexes, such as (η⁴-1,5-cyclooctadienyl)diphenylplatinum, η-cyclooctatetraenyl)diphenylplatinum, (η⁴-2,5-norbornadienyl)diphenylplatinum, (η⁴-1,5-cyclooctadienyl)bis-(4-dimethylaminophenyl)platinum, (η⁴-1,5-cyclooctadienyl)bis-(4-acetylphenyl)platinum, and (η⁴-1,5-cyclooctadienyl)bis-(4-trifluoromethylphenyl)platinum. Typically, the photoactivatable hydrosilylation-reaction catalyst is a Pt(II) β-diketonate complex and more typically the catalyst is platinum(II) bis(2,4-pentanedioate).

The hydrosilylation-reaction catalyst is present in the composition in a catalytic amount, i.e., an amount or quantity sufficient to promote curing thereof at desired conditions. The hydrosilylation-reaction catalyst can be a single hydrosilylation-reaction catalyst or a mixture comprising two or more different hydrosilylation-reaction catalysts.

The catalytic amount of the hydrosilylation-reaction catalyst may be >0.01 ppm to 10,000 ppm; alternatively >1,000 ppm to 5,000 ppm. Alternatively, the typical catalytic amount of the hydrosilylation-reaction catalyst is 0.1 ppm to 5,000 ppm, alternatively 1 ppm to 2,000 ppm, alternatively >0 to 1,000 ppm. Alternatively, the catalytic amount of hydrosilylation-reaction catalyst may be 0.01 ppm to 1,000 ppm, alternatively 0.01 ppm to 100 ppm, alternatively 20 ppm to 200 ppm, and alternatively 0.01 ppm to 50 ppm of platinum group metal; based on the total weight of components (A)(1), (A)(2), and any solvent utilized in the reaction.

In specific embodiments, the (A) reaction product comprises a moiety having the following structure:

wherein each R¹ is independently selected and defined above; subscripts a, a′, b, and b′ are each greater than 0, with the proviso that a+b is from 0.05 to 4 and a′+b′ is from 0.05 to 4; subscript c is from 100 to 3,000; subscript c′ is from 100 to 3,000; each D is an independently selected alkylene group, and subscript X is a siloxane moiety.

Subscripts a and b, as well as subscripts a′ and b′, correspond to (i.e., add up to) x in the (A)(1) branched organopolysiloxane. Similarly, subscript c, as well as subscript c′, corresponds to z of the (A)(1) branched organopolysiloxane. The MDQ moiety of the structure above is formed from the (A)(1) branched organopolysiloxane, and the -D-X-D- moiety is formed from the (A)(2) organosilicon compound. The undefined bonds in the structure above can represent Si—R¹ moieties, or represent further Si-D-X-D- moieties from additional crosslink sites.

For example, when the (A)(2) organosilicon compound is a dimethylhydrogen-terminated polydimethylsiloxane, and when R¹ is a vinyl group, then each D is ethylene, and X is a polydimethylsiloxane segment having a DP equivalent to the DP of the (A)(2) organosilicon compound.

The composition comprises the (A) reaction product in an amount of from greater than 0 to 15, alternatively from 0.5 to 10, alternatively from 0.75 to 7, alternatively from 1 to 4, weight percent based on the total weight of the composition.

The composition further comprises (B) an organopolysiloxane having an average of at least two silicon-bonded ethylenically unsaturated groups per molecule. In certain embodiments, the (B) organopolysiloxane has an average, per molecule, of at least two silicon bonded groups having terminal aliphatic unsaturation. This (B) organopolysiloxane may be linear, branched, partly branched, cyclic, resinous (i.e., have a three-dimensional network), or may comprise a combination of different structures. The polyorganosiloxane may have average formula: R⁴ _(a)SiO_((4-a)/2), where each R⁴ is independently selected from a monovalent hydrocarbon group or a monovalent halogenated hydrocarbon group, with the proviso that in each molecule, at least two of R⁴ include aliphatic unsaturation, and where subscript a is selected such that 0<a≤3.2. Suitable monovalent hydrocarbon groups and monovalent halogenated hydrocarbon groups for R⁴ are as described above for R¹. The average formula above for the polyorganosiloxane may be alternatively written as (R⁴ ₃SiO_(1/2))_(b)(R⁴ ₂SiO_(2/2))_(c)(R⁴SiO_(3/2))_(d)(SiO_(4/2))_(e), where R⁴ is defined above, and subscripts b, c, d, and e are each independently from ≥0 to ≤1, with the proviso that a quantity (b+c+d+e)=1. One of skill in the art understands how such M, D, T, and Q units and their molar fractions influence subscript a in the average formula above. T units (indicated by subscript d), Q units (indicated by subscript e) or both, are typically present in polyorganosiloxane resins, whereas D units, indicated by subscript c, are typically present in polyorganosiloxane polymers (and may also be present in polyorganosiloxane resins or branched polyorganosiloxanes).

Alternatively, the (B) organopolysiloxane may be substantially linear, alternatively is linear. The substantially linear organopolysiloxane may have the average formula: R⁴ _(a′)SiO_((4-a′)/2), where each R⁴ and is as defined above, and where subscript a′ is selected such that 1.9≤a′≤2.2.

At 25° C., the substantially linear organopolysiloxane of component (B) may be a flowable liquid or may have the form of an uncured rubber. The substantially linear organopolysiloxane may have a viscosity of from 10 mPa·s to 30,000,000 mPa·s, alternatively from 10 mPa·s to 10,000 mPa·s, alternatively from 100 mPa·s to 1,000,000 mPa·s, and alternatively from 100 mPa·s to 100,000 mPa·s at 25° C. Viscosity may be measured at 25° C. via a Brookfield LV DV-E viscometer with a spindle selected as appropriate to the viscosity of the substantially linear polyorganosiloxane, i.e., RV-1 to RV-7.

Alternatively, when the (B) organopolysiloxane is substantially linear or linear, the (B) organopolysiloxane may have the average unit formula: (R⁶R⁵ ₂SiO_(1/2))_(aa)(R⁶R⁵SiO_(2/2))_(bb)(R⁶ ₂SiO_(2/2))_(cc)(R⁵ ₃SiO_(1/2))_(dd), where each R⁵ is an independently selected monovalent hydrocarbon group that is free of aliphatic unsaturation or a monovalent halogenated hydrocarbon group that is free of aliphatic unsaturation; each R⁶ is independently selected from the group consisting of alkenyl and alkynyl; subscript aa is 0, 1, or 2, subscript bb is 0 or more, subscript cc is 1 or more, subscript dd is 0, 1, or 2, with the provisos that a quantity (aa+dd)≥2, and (aa+dd)=2, with the proviso that a quantity (aa+bb+cc+dd) is 3 to 2,000. Alternatively, subscript cc≥0. Alternatively, subscript bb≥2. Alternatively, the quantity (aa+dd) is 2 to 10, alternatively 2 to 8, and alternatively 2 to 6. Alternatively, subscript cc is 0 to 1,000, alternatively 1 to 500, and alternatively 1 to 200. Alternatively, subscript bb is 2 to 500, alternatively 2 to 200, and alternatively 2 to 100.

The monovalent hydrocarbon group for R⁵ is exemplified by an alkyl group of 1 to 6 carbon atoms, an aryl group of 6 to 10 carbon atoms, a halogenated alkyl group of 1 to 6 carbon atoms, a halogenated aryl group of 6 to 10 carbon atoms, an aralkyl group of 7 to 12 carbon atoms or a halogenated aralkyl group of 7 to 12 carbon atoms, where alkyl, aryl, and halogenated alkyl are as described herein. Alternatively, each R⁵ is an alkyl group. Alternatively, each R⁵ is independently methyl, ethyl or propyl. Each instance of R⁵ may be the same or different. Alternatively, each R⁵ is a methyl group.

The aliphatically unsaturated monovalent hydrocarbon group for R⁶ is capable of undergoing hydrosilylation reaction. Suitable aliphatically unsaturated hydrocarbon groups for R⁶ are exemplified by an alkenyl group as defined herein and exemplified by vinyl, allyl, butenyl, and hexenyl; and alkynyl groups as defined herein and exemplified by ethynyl and propynyl. Alternatively, each R⁶ may be vinyl or hexenyl. Alternatively, each R⁶ is a vinyl group. The alkenyl or alkynyl content of the (B) organopolysiloxane may be 0.1% to 1%, alternatively 0.2% to 0.5%, based on the weight of the (B) organopolysiloxane.

When the (B) organopolysiloxane is substantially linear, alternatively is linear, the at least two aliphatically unsaturated groups may be bonded to silicon atoms in pendent positions, terminal positions, or in both pendent and terminal locations. As a specific example of the (B) organopolysiloxane having pendant silicon-bonded aliphatically unsaturated groups, the (B) organopolysiloxane may have the average unit formula: [(CH₃)₃SiO_(1/2)]₂[(CH₃)₂SiO_(2/2)]_(cc)[(CH₃)ViSiO_(2/2)]_(bb), where subscripts bb and cc are defined above, and Vi indicates a vinyl group. With regard to this average formula, any methyl group may be replaced with a different monovalent hydrocarbon group (such as alkyl or aryl), and any vinyl group may be replaced with a different aliphatically unsaturated monovalent hydrocarbon group (such as allyl or hexenyl). Alternatively, as a specific example of the polyorganosiloxane having an average, per molecule, of at least two silicon-bonded aliphatically unsaturated groups, the (B) organopolysiloxane may have the average formula: Vi(CH₃)₂SiO[(CH₃)₂SiO]_(cc)Si(CH₃)₂Vi, where subscript cc and Vi are defined above. The dimethyl polysiloxane terminated with silicon-bonded vinyl groups may be used alone or in combination with the dimethyl, methyl-vinyl polysiloxane disclosed immediately above as the (B) organopolysiloxane. With regard to this average formula, any methyl group may be replaced with a different monovalent hydrocarbon group, and any vinyl group may be replaced with any terminally aliphatically unsaturated monovalent hydrocarbon group. Because the at least two silicon-bonded aliphatically unsaturated groups may be both pendent and terminal, the (B) organopolysiloxane may alternatively have the average unit formula: [Vi(CH₃)₂SiO_(1/2)]₂[(CH₃)₂SiO_(2/2)]_(cc)[(CH₃)ViSiO_(2/2)]_(bb), where subscripts bb and cc and Vi are defined above.

When the (B) organopolysiloxane is the substantially linear polyorganosiloxane, the (B) organopolysiloxane can be exemplified by a dimethylpolysiloxane capped at both molecular terminals with dimethylvinylsiloxy groups, a methylphenylpolysiloxane capped at both molecular terminals with dimethylvinylsiloxy groups, a copolymer of a methylphenylsiloxane and dimethylsiloxane capped at both molecular terminals with dimethylvinylsiloxy groups, a copolymer of a methylvinylsiloxane and a methylphenylsiloxane capped at both molecular terminals with dimethylvinylsiloxy groups, a copolymer of a methylvinylsiloxane and diphenylsiloxane capped at both molecular terminals with dimethylvinylsiloxy groups, a copolymer of a methylvinylsiloxane, methylphenylsiloxane, and dimethylsiloxane capped at both molecular terminals with dimethylvinylsiloxy groups, a copolymer of a methylvinylsiloxane and a methylphenylsiloxane capped at both molecular terminals with trimethylsiloxy groups, a copolymer of a methylvinylsiloxane and diphenylsiloxane capped at both molecular terminals with trimethylsiloxy groups, and a copolymer of a methylvinylsiloxane, methylphenylsiloxane, and a dimethylsiloxane capped at both molecular terminals with trimethylsiloxy groups.

Alternatively, the (B) organopolysiloxane may comprise a substantially linear, alternatively linear, polyorganosiloxane selected from the group consisting of:

-   i) dimethylvinylsiloxy-terminated polydimethylsiloxane, -   ii) dimethylvinylsiloxy-terminated     poly(dimethylsiloxane/methylvinylsiloxane), -   iii) dimethylvinylsiloxy-terminated polymethylvinylsiloxane, -   iv) trimethylsiloxy-terminated     poly(dimethylsiloxane/methylvinylsiloxane), -   v) trimethylsiloxy-terminated polymethylvinylsiloxane, -   vi) dimethylvinylsiloxy-terminated     poly(dimethylsiloxane/methylvinylsiloxane), -   vii) dimethylvinylsiloxy-terminated     poly(dimethylsiloxane/methylphenylsiloxane), -   viii) dimethylvinylsiloxy-terminated     poly(dimethylsiloxane/diphenylsiloxane), -   ix) phenyl,methyl,vinyl-siloxy-terminated polydimethylsiloxane, -   x) dimethylhexenylsiloxy-terminated polydimethylsiloxane, -   xi) dimethylhexenylsiloxy-terminated     poly(dimethylsiloxane/methylhexenylsiloxane), -   xii) dimethylhexenylsiloxy-terminated polymethylhexenylsiloxane, -   xiii) trimethylsiloxy-terminated     poly(dimethylsiloxane/methylhexenylsiloxane), -   xiv) trimethylsiloxy-terminated polymethylhexenylsiloxane -   xv) dimethylhexenyl-siloxy terminated     poly(dimethylsiloxane/methylhexenylsiloxane), -   xvi) di methylvinylsiloxy-terminated     poly(dimethylsiloxane/methylhexenylsiloxane), and -   xvii) a combination thereof.

Alternatively, the (B) organopolysiloxane may comprise a resinous polyorganosiloxane. The resinous polyorganosiloxane may have the average formula: R⁴ _(a″)SiO_((4-a″)/2), where each R⁴ is independently selected as defined above, and where subscript a″ is selected such that 0.5≤a″≤1.7.

The resinous polyorganosiloxane has a branched or a three dimensional network molecular structure. At 25° C., the resinous polyorganosiloxane may be in a liquid or in a solid form. Alternatively, the resinous polyorganosiloxane may be exemplified by a polyorganosiloxane that comprises only T units, a polyorganosiloxane that comprises T units in combination with other siloxy units (e.g., M, D, and/or Q siloxy units), or a polyorganosiloxane comprising Q units in combination with other siloxy units (i.e., M, D, and/or T siloxy units). Typically, the resinous polyorganosiloxane comprises T and/or Q units. Specific example of the resinous polyorganosiloxane include a vinyl-terminated silsesquioxane (i.e., T resin) and a vinyl-terminated MDQ resin.

Alternatively, the (B) organopolysiloxane may comprise a branched siloxane, a silsesquioxane, or both a branched siloxane and a silsesquioxane.

When the (B) organopolysiloxane comprises a blend of different organopolysiloxanes, the blend may be a physical blend or mixture. For example, when the (B) organopolysiloxane comprises the branched siloxane and the silsesquioxane, the branched siloxane and the silsesquioxane are present in amounts relative to one another such that the amount of the branched siloxane and the amount of the silsesquioxane combined total 100 weight parts, based on combined weights of all components present in the composition. The branched siloxane may be present in an amount of 50 to 100 parts by weight, and the silsesquioxane may be present in an amount of 0 to 50 parts by weight. Alternatively, the branched siloxane may be present in an amount 50 to 90 parts by weight and the silsesquioxane may be present in an amount of 10 to 50 parts by weight. Alternatively, the branched siloxane may be present in an amount of 50 to 80 parts by weight and the silsesquioxane may be present in an amount of 20 to 50 parts by weight. Alternatively, the branched siloxane may be present in an amount of 50 to 76 parts by weight and the silsesquioxane may be present in an amount of 24 to 50 parts by weight. Alternatively, the branched siloxane may be present in an amount of 50 to 70 parts by weight and the silsesquioxane may be present in an amount of 30 to 50 parts by weight.

The branched siloxane of the (B) organopolysiloxane may have unit formula: (R⁷ ₃SiO_(1/2))_(p)(R⁸R⁷ ₂SiO_(1/2))_(q)(R⁷ ₂SiO_(2/2))_(r)(SiO_(4/2))_(s), where each R⁷ is independently a monovalent hydrocarbon group free of aliphatic unsaturation or a monovalent halogenated hydrocarbon group free of aliphatic unsaturation and each R⁸ is an alkenyl group or an alkynyl group, both of which are as described above, subscript p≥0, subscript q>0, 15≥r≥995, and subscript s is >0.

In the unit formula immediately above, subscript p≥0. Subscript q>0. Alternatively, subscript q≥3. Subscript r is from 15 to 995. Subscript s is >0. Alternatively, subscript s≥1. Alternatively, for subscript p: 22≥p≥0; alternatively 20≥p≥0; alternatively 15≥p≥0; alternatively 10≥p≥0; and alternatively 5≥p≥0. Alternatively, for subscript q: 22≥q >0; alternatively 22≥q≥4; alternatively 20≥q>0; alternatively 15≥q>1; alternatively 10≥q≥2; and alternatively 15≥q≥4. Alternatively, for subscript r: 800≥r≥15; and alternatively 400≥r≥15. Alternatively, for subscript s: 10≥s>0; alternatively, 10≥s≥1; alternatively 5≥s>0; and alternatively s=1. Alternatively, subscript s is 1 or 2. Alternatively, when subscript s=1, subscript p may be 0 and subscript q may be 4.

The branched siloxane may contain at least two polydiorganosiloxane chains of formula (R⁷ ₂SiO_(2/2))_(m), where each subscript m is independently 2 to 100. Alternatively, the branched siloxane may comprise at least one unit of formula (SiO_(4/2)) bonded to four polydiorganosiloxane chains of formula (R⁷ ₂SiO_(2/2))_(o), where each subscript o is independently 1 to 100. Alternatively, the branched siloxane may have formula:

where subscript u is 0 or 1, each subscript t is independently 0 to 995, alternatively 15 to 995, and alternatively 0 to 100; each R⁹ is an independently selected monovalent hydrocarbon group, each R⁷ is an independently selected monovalent hydrocarbon group that is free of aliphatic unsaturation or a monovalent halogenated hydrocarbon group that is free of aliphatic unsaturation as described above, and each R⁸ is independently selected from the group consisting of alkenyl and alkynyl as described above. Suitable branched siloxanes are exemplified by those disclosed in U.S. Pat. No. 6,806,339 and U.S. Patent Publication 2007/0289495.

The silsesquioxane may have unit formula: (R⁷ ₃SiO_(1/2))_(i)(R⁸R⁷ ₂SiO_(1/2))_(f)(R⁷ ₂SiO_(2/2))_(g)(R⁷SiO_(3/2))_(h), where R⁷ and R⁸ are as described above, subscript i≥0, subscript f>0, subscript g is 15 to 995, and subscript h>0. Subscript i may be 0 to 10. Alternatively, for subscript i: 12≥i≥0; alternatively 10≥i≥0; alternatively 7≥i≥0; alternatively 5≥i≥0; and alternatively 3≥i≥0.

Alternatively, subscript f≥1. Alternatively, subscript f≥3. Alternatively, for subscript f: 12≥f>0; alternatively 12≥f≥3; alternatively 10≥f>0; alternatively 7≥f>1; alternatively 5≥f≥2; and alternatively 7≥f≥3. Alternatively, for subscript g: 800≥g≥15; and alternatively 400≥g≥15. Alternatively, subscript h≥1. Alternatively, subscript h is 1 to 10. Alternatively, for subscript h: 10≥h>0; alternatively 5≥h>0; and alternatively h=1. Alternatively, subscript h is 1 to 10, alternatively subscript h is 1 or 2. Alternatively, when subscript h=1, then subscript f may be 3 and subscript i may be 0. The values for subscript f may be sufficient to provide the silsesquioxane of unit formula (ii-II) with an alkenyl content of 0.1% to 1%, alternatively 0.2% to 0.6%, based on the weight of the silsesquioxane. Suitable silsesquioxanes are exemplified by those disclosed in U.S. Pat. No. 4,374,967.

The (B) organopolysiloxane may have the formula (R³ _(y)R¹ _(3-y)SiO_(1/2))_(x′)(R¹ ₂SiO_(2/2))_(z′)(SiO_(4/2))_(1.0)(ZO_(1/2))_(w), where each R³ is an independently selected ethylenically unsaturated group, subscript y is independently selected in each siloxy unit indicated by subscript x; each R¹ is independently selected and defined above; subscript x′ is from 1.5 to 4; Z is independently elected and defined above; subscript w is from 0 to 3; and subscript z′ is from 3 to 1,000.

The (B) organopolysiloxane may comprise a combination or two or more different polyorganosiloxanes that differ in at least one property such as structure, molecular weight, monovalent groups bonded to silicon atoms and content of aliphatically unsaturated groups. The composition may comprise the (B) organopolysiloxane in an amount of from 60 to 99.5, alternatively from 60 to 98, alternatively from 60 to 95, alternatively from 70 to 95, alternatively from 75 to 95, weight percent based on the total weight of the composition.

When the composition consists essentially of, alternatively consists of, components (A) and (B), i.e., in the absence of any catalyst or cross-linker, the composition may be referred to as a base composition. The base composition is typically combined with other components to give a composition that is curable, generally via hydrosilylation, which can be cured to give a release coating. Said differently, the base composition is typically combined with other components to give a curable composition, which can be utilize to form release coatings or liners. The curable composition can be referred to as a release composition or a release coating composition.

In certain embodiments, the composition further comprises (C) an organosilicon compound having an average of at least two silicon-bonded hydrogen atoms per molecule. Suitable examples of the (C) organosilicon compound are set forth above with respect to the (A)(2) organosilicon compound and are incorporated herein by reference. Components (C) and (A)(2) may be the same as or different from one another. In certain embodiments, component (A)(2) includes terminal silicon-bonded hydrogen atoms, whereas component (C) includes pendent silicon-bonded hydrogen atoms.

The (C) organosilicon compound may comprise a combination or two or more different organohydrogensiloxanes that differ in at least one property such as structure, molecular weight, monovalent groups bonded to silicon atoms and content of silicon-bonded hydrogen atoms. The composition may comprise the (C) organosilicon compound in an amount to give a molar ratio of silicon-bonded hydrogen atoms in component (C) to silicon-bonded ethylenically unsaturated groups in component (B), in an amount of from 1:1 to 5:1, alternatively from 1.1:1 to 3.1.

In certain embodiments, the composition further comprises (D) a hydrosilylation-reaction catalyst. The (D) hydrosilylation-reaction catalyst is not limited and may be any known hydrosilylation-reaction catalyst for catalyzing hydrosilylation reactions. Combinations of different hydrosilylation-reaction catalysts may be utilized. Specific examples of suitable (D) hydrosilylation-reaction catalysts are set forth above with respect to the hydrosilylation-reaction catalysts suitable for forming the (A) reaction product, which are incorporated herein by reference.

The (D) hydrosilylation-reaction catalyst is present in the composition in a catalytic amount, i.e., an amount or quantity sufficient to promote curing thereof at desired conditions. The hydrosilylation-reaction catalyst can be a single hydrosilylation-reaction catalyst or a mixture comprising two or more different hydrosilylation-reaction catalysts.

The catalytic amount of the (D) hydrosilylation-reaction catalyst may be >0.01 ppm to 10,000 ppm; alternatively >1,000 ppm to 5,000 ppm. Alternatively, the typical catalytic amount of the (D) hydrosilylation-reaction catalyst is 0.1 ppm to 5,000 ppm, alternatively 1 ppm to 2,000 ppm, alternatively >0 to 1,000 ppm. Alternatively, the catalytic amount of (D) hydrosilylation-reaction catalyst may be 0.01 ppm to 1,000 ppm, alternatively 0.01 ppm to 100 ppm, alternatively 20 ppm to 200 ppm, and alternatively 0.01 ppm to 50 ppm of platinum group metal; based on the total weight of composition.

The composition may further comprise one or more of: (E) an inhibitor, (F) an anchorage additive, (G) an anti-mist additive, (H) a release modifier, and (I) a vehicle.

In certain embodiments, the composition further comprises the (E) inhibitor. The (E) inhibitor may be used for altering the reaction rate or curing rate of the composition, as compared to a composition containing the same starting materials but with the (E) inhibitor omitted. The (E) inhibitor is exemplified by acetylenic alcohols such as methyl butynol, ethynyl cyclohexanol, dimethyl hexynol, and 3,5-dimethyl-1-hexyn-3-ol, 1-butyn-3-ol, 1-propyn-3-ol, 2-methyl-3-butyn-2-ol, 3-methyl-1-butyn-3-ol, 3-methyl-1-pentyn-3-ol, 3-phenyl-1-butyn-3-ol, 4-ethyl-1-octyn-3-ol, and 1-ethynyl-1-cyclohexanol, and a combination thereof; cycloalkenylsiloxanes such as methylvinylcyclosiloxanes exemplified by 1,3,5,7-tetramethyl-1,3,5,7-tetravinylcyclotetrasiloxane, 1,3,5,7-tetramethyl-1,3,5,7-tetrahexenylcyclotetrasiloxane, and a combination thereof; ene-yne compounds such as 3-methyl-3-penten-1-yne, 3,5-dimethyl-3-hexen-1-yne; triazoles such as benzotriazole; phosphines; mercaptans; hydrazines; amines, such as tetramethyl ethylenediamine, dialkyl fumarates, dialkenyl fumarates, dialkoxyalkyl fumarates, maleates such as diallyl maleate; nitriles; ethers; carbon monoxide; alkenes such as cyclo-octadiene, divinyltetramethyldisiloxane; alcohols such as benzyl alcohol; and a combination thereof. Alternatively, the (E) inhibitor may be selected from the group consisting of acetylenic alcohols (e.g., 1-ethynyl-1-cyclohexanol) and maleates (e.g., diallyl maleate, bis maleate, or n-propyl maleate) and a combination of two or more thereof.

Alternatively, the (E) inhibitor may be a silylated acetylenic compound. Without wishing to be bound by theory, it is thought that adding a silylated acetylenic compound reduces yellowing of the reaction product prepared from hydrosilylation reaction of the composition as compared to a reaction product from hydrosilylation of a composition that does not contain a silylated acetylenic compound or that contains an organic acetylenic alcohol inhibitor, such as those described above.

The silylated acetylenic compound is exemplified by (3-methyl-1-butyn-3-oxy)trimethylsilane, ((1,1-dimethyl-2-propynyl)oxy)trimethylsilane, bis(3-methyl-1-butyn-3-oxy)dimethylsilane, bis(3-methyl-1-butyn-3-oxy)silanemethylvinylsilane, bis((1,1-dimethyl-2-propynyl)oxy)dimethylsilane, methyl(tris(1,1-dimethyl-2-propynyloxy))silane, methyl(tris(3-methyl-1-butyn-3-oxy))silane, (3-methyl-1-butyn-3-oxy)dimethylphenylsilane, (3-methyl-1-butyn-3-oxy)dimethylhexenylsilane, (3-methyl-1-butyn-3-oxy)triethylsilane, bis(3-methyl-1-butyn-3-oxy)methyltrifluoropropylsilane, (3,5-dimethyl-1-hexyn-3-oxy)trimethylsilane, (3-phenyl-1-butyn-3-oxy)diphenylmethylsilane, (3-phenyl-1-butyn-3-oxy)dimethylphenylsilane, (3-phenyl-1-butyn-3-oxy)dimethylvinylsilane, (3-phenyl-1-butyn-3-oxy)dimethylhexenylsilane, (cyclohexyl-1-ethyn-1-oxy)dimethylhexenylsilane, (cyclohexyl-1-ethyn-1-oxy)dimethylvinylsilane, (cyclohexyl-1-ethyn-1-oxy)diphenylmethylsilane, (cyclohexyl-1-ethyn-1-oxy)trimethylsilane, and combinations thereof. Alternatively, the (E) inhibitor is exemplified by methyl(tris(1,1-dimethyl-2-propynyloxy))silane, ((1,1-dimethyl-2-propynyl)oxy)trimethylsilane, or a combination thereof. The silylated acetylenic compound useful as the (E) inhibitor may be prepared by methods known in the art, such as silylating an acetylenic alcohol described above by reacting it with a chlorosilane in the presence of an acid receptor.

The amount of the (E) inhibitor present in the composition will depend on various factors including the desired pot life of the composition, whether the composition will be a one part composition or a multiple part composition, the particular inhibitor used, and the selection and amount of components (A)-(D). However, when present, the amount of the (E) inhibitor may be 0% to 1%, alternatively 0% to 5%, alternatively 0.001% to 1%, alternatively 0.01% to 0.5%, and alternatively 0.0025% to 0.025%, based on the total weight of the composition.

In certain embodiments, the composition further comprises the (F) anchorage additive. Suitable anchorage additives are exemplified by a reaction product of a vinyl alkoxysilane and an epoxy-functional alkoxysilane; a reaction product of a vinyl acetoxysilane and epoxy-functional alkoxysilane; and a combination (e.g., physical blend and/or a reaction product) of a polyorganosiloxane having at least one aliphatically unsaturated hydrocarbon group and at least one hydrolyzable group per molecule and an epoxy-functional alkoxysilane (e.g., a combination of a hydroxy-terminated, vinyl functional polydimethylsiloxane with glycidoxypropyltrimethoxysilane). Alternatively, the anchorage additive may comprise a polyorganosilicate resin. Suitable anchorage additives and methods for their preparation are disclosed, for example, in U.S. Pat. No. 9,562,149; U.S. Patent Application Publication Numbers 2003/0088042, 2004/0254274, and 2005/0038188; and European Patent 0 556 023.

Further examples of suitable anchorage additives include a transition metal chelate, a hydrocarbonoxysilane such as an alkoxysilane, a combination of an alkoxysilane and a hydroxy-functional polyorganosiloxane, or a combination thereof. The (F) anchorage additive may be a silane having at least one substituent having an adhesion-promoting group, such as an epoxy, acetoxy or acrylate group. The adhesion-promoting group may additionally or alternatively be any hydrolysable group which does not impact the (D) hydrosilylation-reaction catalyst. Alternatively, the (F) anchorage additive may comprise a partial condensate of such a silane, e.g. an organopolysiloxane having an adhesion-promoting group. Alternatively still, the (F) anchorage additive may comprise a combination of an alkoxysilane and a hydroxy-functional polyorganosiloxane.

Alternatively, the (F) anchorage additive may comprise an unsaturated or epoxy-functional compound. The (F) anchorage additive may comprise an unsaturated or epoxy-functional alkoxysilane. For example, the functional alkoxysilane can include at least one unsaturated organic group or an epoxy-functional organic group. Epoxy-functional organic groups are exemplified by 3-glycidoxypropyl and (epoxycyclohexyl)ethyl. Unsaturated organic groups are exemplified by 3-methacryloyloxypropyl, 3-acryloyloxypropyl, and unsaturated monovalent hydrocarbon groups such as vinyl, allyl, hexenyl, undecylenyl. One specific example of an unsaturated compound is vinyltriacetoxysilane.

Specific examples of suitable epoxy-functional alkoxysilanes include 3-glycidoxypropyltrimethoxysilane, 3-glycidoxypropyltriethoxysilane, (epoxycyclohexyl)ethyldimethoxysilane, (epoxycyclohexyl)ethyldiethoxysilane and combinations thereof. Examples of suitable unsaturated alkoxysilanes include vinyltrimethoxysilane, allyltrimethoxysilane, allyltriethoxysilane, hexenyltrimethoxysilane, undecylenyltrimethoxysilane, 3-methacryloyloxypropyl trimethoxysilane, 3-methacryloyloxypropyl triethoxysilane, 3-acryloyloxypropyl trimethoxysilane, 3-acryloyloxypropyl triethoxysilane, and combinations thereof.

The (F) anchorage additive may also comprise the reaction product or partial reaction product of one or more of these compounds. For example, in a specific embodiment, the (F) anchorage additive may comprise the reaction product or partial reaction product of vinyltriacetoxysilane and 3-glycidoxypropyltrimethoxysilane. Alternatively or in addition, the (F) anchorage additive may comprise alkoxy or alkenyl functional siloxanes.

Alternatively, the (F) anchorage additive may comprise an epoxy-functional siloxane such as a reaction product of a hydroxy-terminated polyorganosiloxane with an epoxy-functional alkoxysilane, as described above, or a physical blend of the hydroxy-terminated polyorganosiloxane with the epoxy-functional alkoxysilane. The (F) anchorage additive may comprise a combination of an epoxy-functional alkoxysilane and an epoxy-functional siloxane. For example, the (F) anchorage additive is exemplified by a mixture of 3-glycidoxypropyltrimethoxysilane and a reaction product of hydroxy-terminated methylvinylsiloxane with 3-glycidoxypropyltrimethoxysilane, or a mixture of 3-glycidoxypropyltrimethoxysilane and a hydroxy-terminated methylvinylsiloxane, or a mixture of 3-glycidoxypropyltrimethoxysilane and a hydroxy-terminated methylvinyl/dimethylsiloxane copolymer.

Alternatively, the (F) anchorage additive may comprise a transition metal chelate. Suitable transition metal chelates include titanates, zirconates such as zirconium acetylacetonate, aluminum chelates such as aluminum acetylacetonate, and combinations thereof. Alternatively, the (F) anchorage additive may comprise a combination of a transition metal chelate with an alkoxysilane, such as a combination of glycidoxypropyltrimethoxysilane with an aluminum chelate or a zirconium chelate.

The particular amount of the (F) anchorage additive present in the composition, if utilized, depends on various factors including the type of substrate and whether a primer is used. In certain embodiments, the (F) anchorage additive is present in the composition in an amount of from 0 to 2 parts by weight, per 100 parts by weight of component (B). Alternatively, the (F) anchorage additive is present in the composition in an amount of from 0.01 to 2 parts by weight, per 100 parts by weight of component (B).

In certain embodiments, the composition further comprises the (G) anti-mist additive. The (G) anti-mist additive is distinguished from component (A), which also serves as an anti-mist additive when the composition is utilized to prepare a release coating. The (G) anti-mist additive may be utilized in the composition to reduce or suppress silicone mist formation in coating processes, particularly with high speed coating equipment. The (G) anti-mist additive may be a reaction product of an organohydrogensilicon compound, an oxyalkylene compound or an organoalkenylsiloxane with at least three silicon bonded alkenyl groups per molecule, and a suitable catalyst. Suitable anti-mist additives are disclosed, for example, in U.S. Patent Application 2011/0287267; U.S. Pat. Nos. 8,722,153; 6,586,535; and 5,625,023.

The amount of the (G) anti-mist additive utilized in the composition will depend on various factors including the amount and type of other starting materials selected for the composition. However, the (G) anti-mist additive is typically utilized in an amount of from 0% to 10%, alternatively 0.1% to 3%, based on the total weight of the composition. This amount excludes that associated with component (A), and only relates to the (G) anti-mist additive that is separate and distinct from component (A).

In certain embodiments, the composition further comprises the (H) release modifier, which may be utilized in the composition to control (decrease) the level of release force (the adhesive force between the release coating formed from the composition and an adherend thereto, such as a label including a pressure sensitive adhesive). Release coatings having the required or desired release force can be formulated from a modifier-free composition by adjusting the level or concentration of the (H) release modifier. Examples of suitable release modifiers for component (H) include trimethylsiloxy-terminated dimethyl, phenylmethylsiloxanes. Alternatively, the (H) release modifier may be a condensation reaction product of an organopolysiloxane resin having hydroxyl or alkoxy groups and a diorganopolysiloxane with at least one hydroxyl or hydrolyzable group. Examples of suitable release modifiers are disclosed, for example, in U.S. Pat. No. 8,933,177 and U.S. Patent Application Publication 2016/0053056. When utilized, the (H) release modifier can be present in the composition in an amount of from 0 to 85 parts by weight, alternatively 25 to 85 parts, per 100 parts of component (B).

In certain embodiments, the composition further comprises the (I) vehicle. The (I) vehicle typically solubilizes the components of the composition and, if the components solubilize, the (I) vehicle may be referred to as a solvent. Suitable vehicles include silicones, both linear and cyclic, organic oils, organic solvents and mixtures of these.

Typically, the (I) vehicle, if present in the composition, is an organic liquid. Organic liquids includes those considered oils or solvents. The organic liquids are exemplified by, but not limited to, aromatic hydrocarbons, aliphatic hydrocarbons, alcohols having more than 3 carbon atoms, aldehydes, ketones, amines, esters, ethers, glycols, glycol ethers, alkyl halides and aromatic halides. Hydrocarbons include isododecane, isohexadecane, Isopar L (C11-C13), Isopar H(C11-C12), hydrogenated polydecene, aromatic hydrocarbons, and halogenated hydrocarbons. Ethers and esters include isodecyl neopentanoate, neopentylglycol heptanoate, glycol distearate, dicaprylyl carbonate, diethylhexyl carbonate, propylene glycol n-butyl ether, ethyl-3 ethoxypropionate, propylene glycol methyl ether acetate, tridecyl neopentanoate, propylene glycol methylether acetate (PGMEA), propylene glycol methylether (PGME), octyldodecyl neopentanoate, diisobutyl adipate, diisopropyl adipate, propylene glycol dicaprylate/dicaprate, octyl ether, and octyl palmitate. Additional organic fluids suitable as a stand-alone compound or as an ingredient to the (I) vehicle include fats, oils, fatty acids, and fatty alcohols. The (I) vehicle may also be a low viscosity organopolysiloxane or a volatile methyl siloxane or a volatile ethyl siloxane or a volatile methyl ethyl siloxane having a viscosity at 25° C. in the range of 1 to 1,000 mm²/sec, such as hexamethylcyclotrisiloxane, octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane, dodecamethylcyclohexasiloxane, octamethyltrisiloxane, decamethyltetrasiloxane, dodecamethylpentasiloxane, tetradecamethylhexasiloxane, hexadeamethylheptasiloxane, heptamethyl-3-{(trimethylsilyl)oxy)}trisiloxane, hexamethyl-3,3, bis{(trimethylsilyl)oxy}trisiloxane pentamethyl{(trimethylsilyl)oxy}cyclotrisiloxane as well as polydimethylsiloxanes, polyethylsiloxanes, polymethylethylsiloxanes, polymethylphenylsiloxanes, polydiphenylsiloxanes, caprylyl methicone, and any mixtures thereof.

In specific embodiments, the (I) vehicle is selected from polyalkylsiloxanes; tetrahydrofuran; mineral spirits; naphtha; an alcohol such as methanol, ethanol, isopropanol, butanol, or n-propanol; a ketone such as acetone, methylethyl ketone, or methyl isobutyl ketone; an aromatic hydrocarbon such as benzene, toluene, or xylene; an aliphatic hydrocarbon such as heptane, hexane, or octane; a glycol ether such as propylene glycol methyl ether, dipropylene glycol methyl ether, propylene glycol n-butyl ether, propylene glycol n-propyl ether, or ethylene glycol n-butyl ether; or a combination thereof. In one embodiment, when the composition is in the form of an emulsion, the (I) vehicle can comprise, alternatively consist of, an aqueous medium, or water.

The amount of the (I) vehicle will depend on various factors including the type of vehicle selected and the amount and type of other components present in the composition. However, the amount of the (I) vehicle in the composition may be from 0% to 99%, alternatively 2% to 50%, based on the total weight of the composition. The (I) vehicle may be added during preparation of the composition, for example, to aid mixing and delivery. All or a portion of the (I) vehicle may optionally be removed after the composition is prepared, including prior to and/or contemporaneous with preparing the release coating from the composition.

Other optional components may be present in the composition, including, for example, reactive diluents, fragrances, preservatives, colorants, dyes, and fillers, for example, silica, quartz or chalk.

Alternatively, the composition and release coating formed therefrom may be free of particulates or contains only a limited amount of particulate (e.g., filler and/or pigment), such as 0 to 30% by weight of the composition. Particulates can agglomerate or otherwise stick to the coater equipment used to form the release coating. In addition, particulates can hinder optical properties, for example transparency, of the release coating and of the release liner formed therewith, if optical transparency is desired. The particulates may be prejudicial to the adherence of an adherend.

In certain embodiments, the composition is free from fluoroorganosilicone compounds. It is believed that, during the cure, a fluorocompound, because of its low surface tension, may rapidly migrate to the interface of the composition or the release coating formed therewith and a substrate on which the composition is applied and the release coating is formed, for example a composition/PET film interface. Such migration may prevent adherence of the release coating (prepared by curing the composition) to the substrate by making a fluorine containing barrier. By making a barrier, the fluoroorganosilicone compounds may prevent any component of the composition from reacting at the interface, impacting curing and related properties. Moreover, fluoroorganosilicone compounds are usually expensive.

The composition in its curable form may be prepared by combining components (A)-(D), as well as any optional components, described above, in any order of addition, optionally with a master batch, and optionally under shear. As described in greater detail below, the composition may be a one part composition, a two component or 2K composition, or a multi-part composition. For example, components (A) and (B) may be a single part of the composition. When the composition is utilized to prepare the release coating or coated substrate, as described below, components (A) and (B) are combined with components (C) and (D), as well as any optional components, such that the composition is a curable composition. When the composition further comprises components (C) and (D), the composition may be referred to as the curable composition.

In various embodiments, the composition may be prepared as an emulsion, e.g. an oil-in-water or water-in-oil emulsion depending on the selection of the continuous and discontinuous phase thereof. In these embodiments, the (I) vehicle is present in the composition as an aqueous medium, or water. The oil phase of the emulsion comprises the silicone components of the composition, i.e., at least components (A) and (B), as well as component (C), when present. In certain embodiments, the oil phase may further comprise an organic oil or a silicone oil to carry at least components (A) and (B), as well as component (C), when present. However, the organic oil or silicone oil is not required to prepare the emulsion. In addition, the emulsion can be a multi-part emulsion comprising different emulsions having different components, which multi-parts of the emulsion are combined and mixed in connection with curing. The emulsion can comprise any of the optional components described above in any part.

When utilized, the organic oil is typically a non-reactive or inert, i.e., the organic oil does not participate in any reaction in connection with curing the reactive components of the composition. Typically, the silicone components (e.g. components (A), (B), and (C), when present) are dispersed in the oil phase rather than the aqueous phase of the emulsion.

In certain embodiments, suitable organic oils include those which dissolve at least components (A) and (B), which typically forms a clear solution, and those which can be combined with at least components (A) and (B) to form a homogeneous dispersion without phase separation prior to, during, and/or after the formation of the emulsion. The organic oil may be, for example, any one or combination of the following: hydrocarbon oils, such as mineral oil fractions comprising linear (e.g., n-paraffinic) mineral oils, branched (iso-paraffinic) mineral oils, and/or cyclic (sometimes referred to as naphthenic) mineral oils, the hydrocarbons in the oil fractions comprising from 5 to 25 carbon atoms per molecule, or a liquid linear or branched paraffin containing 12 to 40 carbon atoms; polyisobutylenes (PIB); phosphate esters, such as trioctyl phosphate; polyalkylbenzenes; linear and/or branched alkylbenzenes, such as heavy alkylates, dodecyl benzene and other alkylarenes; esters of aliphatic monocarboxylic acids; linear or branched mono unsaturated hydrocarbons, such as linear or branched alkenes or mixtures thereof containing from 8 to 25 carbon atoms; and natural oils and derivatives thereof.

In one embodiment, the organic oil may include mineral oil fractions, natural oils, alkylcycloaliphatic compounds, alkybenzenes including polyalkylbenzenes, or combinations thereof.

Alkylbenzene compounds suitable for use as the organic oil include, for example, heavy alkylate alkylbenzenes and alkylcycloaliphatic compounds. Heavy alkylate alkylbenzenes include, for example, alkyl substituted aryl compounds which have aryl groups, such as benzene substituted by alkyl and/or other substituents. Additional examples include the extenders described in U.S. Pat. No. 4,312,801, which is incorporated by reference in its entirety.

Any suitable mixture of mineral oil fractions or mineral oil fractions in combination with any other organic oils may be used as the organic oil. Additional examples of organic oils include alkylcyclohexanes and paraffinic hydrocarbons (which may be linear, branched, or cyclic). The cyclic paraffinic hydrocarbons may be monocyclic and/or polycyclic hydrocarbons (naphthenics).

In another embodiment, the organic oil may comprise a natural oil. Natural oils are oils that are not derived from petroleum. More specifically, natural oils are derived from animals and/or vegetative matter (including seeds and nuts). Common natural oils include triglycerides of mixtures of fatty acids, particularly mixtures containing some unsaturated fatty acid. Alternatively, the organic oil may be a derivative of a natural oil such as a transesterified vegetable oil, a boiled natural oil, a blown natural oil, or a stand oil (e.g. a thermally polymerized oil). The natural oil may be derived from a variety of sources and may comprise, for example, wheatgerm, sunflower, grapeseed, castor, shea, avocado, olive, soybean, sweet almond, palm, rapeseed, cotton seed, hazelnut, macadamia, jojoba, blackcurrant, evening primrose, and combinations thereof.

Alternatively to the liquids exemplified above, the organic oil may be a solid, such as a wax. When the organic oil comprises a wax, the wax typically has a melting point of from 30 to 100° C. The wax may be, for example, a hydrocarbon wax, such as a petroleum-derived wax; a wax comprising carboxylic esters, such as beeswax, lanolin, tallow, carnauba, candelilla, tribehenin; or a wax derived from plant seeds, fruits, nuts or kernel, including softer waxes referred to as ‘butter,’ such as mango butter, shea butter or cocoa butter. The wax may alternatively be a polyether wax or a silicone wax.

Notably, when the organic oil comprises a mineral oil, the organic oil and at least components (A) and (B) are typically miscible, i.e., form a homogenous mixture. In contrast, when the organic oil comprises a natural oil, the organic oil and at least components (A) and (B) are commonly immiscible, i.e., form a heterogeneous mixture.

The mixture formed by combining component (A), (B), and optionally components (C) and/or (D) and, if utilized, the organic and/or silicone oil, may be heterogeneous or homogenous. The organic oil may solubilize, alternatively partially solubilize, at least components (A) and (B), optionally also components (C) and (D) if present. The organic oil may be referred to as a carrier or a solvent depending on whether components (A) and (B) solubilize or dissolve in the organic oil. The mixture can be formed in any manner, including any order of addition, with optional mixing or stirring.

The method further comprises combining the mixture, an aqueous medium and a surfactant to form the emulsion. The mixture is typically a discontinuous phase in the aqueous medium of the emulsion. The emulsion may be formed via the application of shear, e.g. by mixing, shaking, stirring, etc. The discontinuous phase of the emulsion is generally present as particles in the aqueous medium. The particles are liquid and may have generally spherical or other shapes, and may have varying sizes based on the components selected and their relative amounts.

The aqueous medium comprises water. The water may be from any source and may optionally be purified, e.g. via distillation, reverse osmosis, etc. The aqueous medium may further comprise one or more additional components other than water, as described below.

The surfactant may be any surfactant capable of emulsifying the various components or improving stability of the emulsion. For example, the surfactant may comprise one or more anionic, cationic, nonionic, and/or amphoteric surfactants, organomodified silicones such as dimethicone copolyol, oxyethylenated and/or oxypropylenated ethers of glycerol, oxyethylenated and/or oxypropylenated ethers of fatty alcohols such as ceteareth-30, C12-15 pareth-7, fatty acid esters of polyethylene glycol such as PEG-50 stearate, PEG-40 monostearate, saccharide esters and ethers such as sucrose stearate, sucrose cocoate and sorbitan stearate, and mixtures thereof, phosphoric esters and salts thereof such as DEA oleth-10 phosphate, sulphosuccinates such as disodium PEG-5 citrate lauryl sulphosuccinate and disodium ricinoleamido MEA sulphosuccinate, alkyl ether sulphates such as sodium lauryl ether sulphate, isethionates, betaine derivatives, and mixtures thereof.

In certain embodiments, the surfactant comprises the anionic surfactant. Anionic surfactants include, for example, carboxylates (sodium 2-(2-hydroxyalkyloxy)acetate)), amino acid derivatives (N-acylglutamates, N-acylgly-cinates or acylsarcosinates), alkyl sulfates, alkyl ether sulfates and oxyethylenated derivatives thereof, sulfonates, isethionates and N-acylisethionates, taurates and N-acyl N-methyltaurates, sulfosuccinates, alkylsulfoacetates, phosphates and alkyl phosphates, polypeptides, anionic derivatives of alkyl polyglycoside (acyl-D-galactoside uronate), and fatty acid soaps, alkali metal sulforicinates, sulfonated glyceryl esters of fatty acids such as sulfonated monoglycerides of coconut oil acids, salts of sulfonated monovalent alcohol esters such as sodium oleylisethianate, amides of amino sulfonic acids such as the sodium salt of oleyl methyl tauride, sulfonated products of fatty acids nitriles such as palmitonitrile sulfonate, sulfonated aromatic hydrocarbons such as sodium alpha-naphthalene monosulfonate, condensation products of naphthalene sulfonic acids with formaldehyde, sodium octahydroanthracene sulfonate, alkali metal alkyl sulfates such as sodium lauryl sulfate, ammonium lauryl sulfate and triethanol amine lauryl sulfate, ether sulfates having alkyl groups of 8 or more carbon atoms such as sodium lauryl ether sulfate, ammonium lauryl ether sulfate, sodium alkyl aryl ether sulfates, and ammonium alkyl aryl ether sulfates, alkylarylsulfonates having 1 or more alkyl groups of 8 or more carbon atoms, alkylbenzenesulfonic acid alkali metal salts exemplified by hexylbenzenesulfonic acid sodium salt, octylbenzenesulfonic acid sodium salt, decylbenzenesulfonic acid sodium salt, dodecylbenzenesulfonic acid sodium salt, cetylbenzenesulfonic acid sodium salt, and myristylbenzenesulfonic acid sodium salt, sulfuric esters of polyoxyethylene alkyl ether including CH₃(CH₂)₆CH₂O(C₂H₄O)₂SO₃H, CH₃(CH₂)₇CH₂O(C₂H₄O)_(3.5)SO₃H, CH₃(CH₂)₈CH₂O(C₂H₄O)₈SO₃H, CH₃(CH₂)₁₉CH₂O(C₂H₄O)₄SO₃H, and CH₃(CH₂)₁₀CH₂O(C₂H₄O)₆SO₃H, sodium salts, potassium salts, and amine salts of alkylnaphthylsulfonic acid, and mixtures thereof.

In these or other embodiments, the surfactant comprises the cationic surfactant. Cationic surfactants include, for example, various fatty acid amines and amides and their derivatives, and the salts of the fatty acid amines and amides. Examples of aliphatic fatty acid amines include dodecylamine acetate, octadecylamine acetate, and acetates of the amines of tallow fatty acids, homologues of aromatic amines having fatty acids such as dodecylaniline, fatty amides derived from aliphatic diamines such as undecylimidazoline, fatty amides derived from aliphatic diamines such as undecylimidazoline, fatty amides derived from disubstituted amines such as oleylaminodiethylamine, derivatives of ethylene diamine, quaternary ammonium compounds and their salts which are exemplified by tallow trimethyl ammonium chloride, dioctadecyldimethyl ammonium chloride, didodecyldimethyl ammonium chloride, dihexadecyl ammonium chloride, alkyltrimethylammonium hydroxides such as octyltrimethylammonium hydroxide, dodecyltrimethylammonium hydroxide, and hexadecyltrimethylammonium hydroxide, dialkyldimethylammonium hydroxides such as octyldimethylammonium hydroxide, decyldimethylammonium hydroxide, didodecyldimethylammonium hydroxide, dioctadecyldimethylammonium hydroxide, tallow trimethylammonium hydroxide, coconut oil, trimethylammonium hydroxide, methylpolyoxyethylene cocoammonium chloride, and dipalmitylhydroxyethylammonium methosulfate, amide derivatives of amino alcohols such as beta-hydroxylethylstearylamide, amine salts of long chain fatty acids, and mixtures thereof.

In these or other embodiments, the surfactant comprises the nonionic surfactant. Nonionic surfactants include, for example, polyoxyethylene alkyl ethers (such as, lauryl, cetyl, stearyl or octyl), polyoxyethylene alkylphenol ethers, polyoxyethylene lauryl ethers, polyoxyethylene sorbitan monooleates, polyoxyethylene alkyl esters, polyoxyethylene sorbitan alkyl esters, polyethylene glycol, polypropylene glycol, diethylene glycol, ethoxylated trimethylnonanols, polyoxyalkylene glycol modified polysiloxane surfactants, polyoxyalkylene-substituted silicones (rake or ABn types), silicone alkanolamides, silicone esters, silicone glycosides, dimethicone copolyols, fatty acid esters of polyols, for instance sorbitol and glyceryl mono-, di-, tri- and sesqui-oleates and stearates, glyceryl and polyethylene glycol laurates; fatty acid esters of polyethylene glycol (such as polyethylene glycol monostearates and monolaurates), polyoxyethylenated fatty acid esters (such as stearates and oleates) of sorbitol, and mixtures thereof.

In these or other embodiments, the surfactant comprises the amphoteric surfactant. Amphoteric surfactants, include, for example, amino acid surfactants, betaine acid surfactants, trimethylnonyl polyethylene glycol ethers and polyethylene glycol ether alcohols containing linear alkyl groups having from 11 to 15 carbon atoms, such as 2,6,8-trimethyl-4-nonyloxypolyethylene oxyethanol (6 EO) (sold as Tergitol® TMN-6 by OSi Specialties, A Witco Company, Endicott, N.Y.), 2,6,8-trimethyl-4-nonyloxypolyethylene oxyethanol (10 EO) (sold as Tergitol® TMN-10 by OSi Specialties, A Witco Company, Endicott, N.Y.), alkylene-oxypolyethylene oxyethanol (C₁₁₋₁₅ secondary alkyl, 9 EO) (sold as Tergitol®15-S-9 by OSi Specialties, A Witco Company, Endicott, N.Y.), alkylene-oxypolyethylene oxyethanol (C₁₁₋₁₅ secondary alkyl, 15 EO) (sold as Tergitol®15-S-15 by OSi Specialties, A Witco Company, Endicott, N.Y.), octylphenoxy polyethoxy ethanols having varying amounts of ethylene oxide units such as octylphenoxy polyethoxy ethanol (40 EO) (sold as Triton® X405 by Rohm and Haas Company, Philadelphia, Pa.), nonionic ethoxylated tridecyl ethers available from Emery Industries, Mauldin, S.C. under the general tradename Trycol, alkali metal salts of dialkyl sulfosuccinates available from American Cyanamid Company, Wayne, N.J. under the general tradename Aerosol, polyethoxylated quaternary ammonium salts and ethylene oxide condensation products of the primary fatty amines (available from Armak Company, Chicago, Ill. under the tradenames Ethoquad, Ethomeen, or Arquad), polyoxyalkylene glycol modified polysiloxanes, N-alkylamidobetaines and derivatives thereof, proteins and derivatives thereof, glycine derivatives, sultaines, alkyl polyaminocarboxylates and alkylamphoacetates, and mixtures thereof. These surfactants may also be obtained from other suppliers under different tradenames.

One of skill in the art can readily optimize relative amounts of components in the emulsion and methods of its preparation. When the curable composition is in the form of the emulsion, the emulsion can be a two part or multi-part emulsion to separate the reactive components and/or catalyst therefrom.

A method of preparing a coated substrate with the composition comprises applying, i.e., disposing, the composition on the substrate. The method further comprises curing the curable composition on the substrate, which results in the formation of the release coating on the substrate to give the coated substrate. Curing may be performed by heating at an elevated temperature, e.g., 50° C. to 180° C., alternatively 50° C. to 120° C., and alternatively 50° C. to 90° C., to give the coated substrate. One skilled in the art would be able to select an appropriate temperature depending on various factors including the selection of the components in the curable composition and the substrate composition or material of construction.

The curable composition may be disposed or dispensed on the substrate in any suitable manner. Typically, the curable composition is applied in wet form via a wet coating technique. The curable composition may be applied by i) spin coating; ii) brush coating; iii) drop coating; iv) spray coating; v) dip coating; vi) roll coating; vii) flow coating; viii) slot coating; ix) gravure coating; x) Meyer bar coating; or xi) a combination of any two or more of i) to x). Typically, disposing the curable composition on the substrate results in a wet deposit on the substrate, which is subsequently cured to give the coated substrate, which comprises a cured film, i.e., the release coating, formed from the curable composition on the substrate.

The substrate is not limited and may be any substrate. The cured film may be separable from the substrate or may be physically and/or chemically bonded to the substrate depending on its selection. The substrate may have an integrated hot plate or an integrated or stand-alone furnace for curing the wet deposit. The substrate may optionally have a continuous or non-continuous shape, size, dimension, surface roughness, and other characteristics. Alternatively, the substrate may have a softening point temperature at the elevated temperature. However, the curable composition and method are not so limited.

Alternatively, the substrate may comprise a plastic, which maybe a thermosetting and/or thermoplastic. However, the substrate may alternatively be or comprise glass, metal, cellulose (e.g. paper), wood, cardboard, paperboard, a silicone, or polymeric materials, or a combination thereof.

Specific examples of suitable substrates include paper substrates such as Kraft paper, polyethylene coated Kraft paper (PEK coated paper), and regular papers; polymeric substrates such polyamides (PA); polyesters such as polyethylene terephthalates (PET), polybutylene terephthalates (PET), polytrimethylene terephthalates (PTT), polyethylene naphthalates (PEN), and liquid crystalline polyesters; polyolefins such as polyethylenes (PE), polypropylenes (PP), and polybutylenes; styrenic resins; polyoxymethylenes (POM); polycarbonates (PC); polymethylenemethacrylates (PMMA); polyvinyl chlorides (PVC); polyphenylene sulfides (PPS); polyphenylene ethers (PPE); polyimides (PI); polyamideimides (PAI); polyetherimides (PEI); polysulfones (PSU); polyethersulfones; polyketones (PK); polyetherketones; polyvinyl alcohols (PVA); polyetheretherketones (PEEK); polyetherketoneketones (PEKK); polyarylates (PAR); polyethernitriles (PEN); phenolic resins; phenoxy resins; celluloses such as triacetylcellulose, diacetylcellulose, and cellophane; fluorinated resins, such as polytetrafluoroethylenes; thermoplastic elastomers, such as polystyrene types, polyolefin types, polyurethane types, polyester types, polyamide types, polybutadiene types, polyisoprene types, and fluoro types; and copolymers, and combinations thereof.

The curable composition, or wet deposit, is typically cured at the elevated temperature for a period of time. The period of time is typically sufficient to effect curing, i.e., cross-linking, of the curable composition. The period of time may be from greater than 0 to 8 hours, alternatively from greater than 0 to 2 hours, alternatively from greater than 0 to 1 hour, alternatively from greater than 0 to 30 minutes, alternatively from greater than 0 to 15 minutes, alternatively from greater than 0 to 10 minutes, alternatively from greater than 0 to 5 minutes, alternatively from greater than 0 to 2 minutes. The period of time depends on various factors including on the elevated temperature is utilized, the temperature selected, desired film thickness, and the presence of absence of any water or vehicle in the curable composition.

Curing the curable composition typically has a dwell time of from 0.1 second to 50 seconds; alternatively from 1 second to 10 seconds; and alternatively from 0.5 second to 30 seconds. Dwell time selected may depend on the substrate selection, temperature selected, and line speed. Dwell time, as used herein, refers to the time during which the curable composition, or wet deposit, is subjected to the elevated temperature. Dwell time is distinguished from cure time, as there may be ongoing curing even after the curable composition, wet deposit, or partially cured reaction intermediary thereof is no longer subjected to the elevated temperature, which typically initiates curing. Alternatively, the coated article may be prepared on a conveyor belt in an oven, and the dwell time may be calculated by dividing a length of the oven (e.g. in meters) by a line speed of the conveyor belt (e.g. in meters/sec).

The period of time may be broken down into cure iterations, e.g. a first-cure and a post-cure, with the first-cure being, for example, one hour and the post cure being, for example, three hours. The elevated temperature may be independently selected from any temperature above room temperature in such iterations, and may be the same in each iteration.

Depending on the optional presence and selection of the (I) vehicle, curing the composition may also include the step of drying. For example, when the composition is in the form of an emulsion such that the (I) Vehicle is present and comprises water, the step of curing typically also removes drying or removing water from the emulsion. Drying may be contemporaneous with curing or may be separate from curing.

Depending on a thickness and other dimensions of the film and coated substrate, the coated substrate can be formed via an iterative process. For example, a first deposit may be formed and subjected to a first elevated temperature for a first period of time to give a partially cured deposit. Then, a second deposit may be disposed on the partially cured deposit and subjected to a second elevated temperature for a second period of time to give a second partially cured deposit. The partially cured deposit will also further cure during exposure to the second elevated temperature for the second period of time. A third deposit may be disposed on the second partially cured deposit and subjected to a third elevated temperature for a third period of time to give a third partially cured deposit. The second partially cured deposit will also further cure during exposure to the second elevated temperature for the second period of time. This process may be repeated, for example, from 1 to 50 times, to build the coated article as desired. A composite is of partially cured layers may be subjected to a final post-cure, e.g. at the elevated temperature and period of time above. Each elevated temperature and period of time may be independently selected and may be the same as or different from one another. When the article is formed via the iterative process, each deposit may also be independently selected and may differ in terms of components selected in the curable composition, their amounts, or both. Alternatively still, each iterative layer may be fully cured, rather than only being partially cured, in such an iterative process.

Alternatively, the deposit may comprise a wet film. Alternatively, the iterative process may be wet-on-wet, depending on a cure state of the partially cured layer. Alternatively, the iterative process may be wet-on-dry.

The coated substrate, which comprises the film formed from the curable composition on the substrate, may have varying dimensions, including relative thicknesses of the film and the substrate. The film has a thickness that may vary depending upon its end use application. The film may have a thickness of greater than 0 to 4,000 μm, alternatively greater than 0 to 3,000 μm, alternatively greater than 0 to 2,000 μm, alternatively greater than 0 to 1,000 μm, alternatively greater than 0 to 500 μm, alternatively greater than 0 to 250 μm. However, other thicknesses are contemplated, e.g. 0.1 to 200 μm. For example, the thickness of the film may be 0.2 to 175 μm; alternatively 0.5 to 150 μm; alternatively 0.75 to 100 μm; alternatively 1 to 75 μm; alternatively 2 to 60 μm; alternatively 3 to 50 μm; and alternatively 4 to 40 μm. Alternatively, when the substrate is plastic, the film may have a thickness of greater than 0 to 200, alternatively greater than 0 to 150 μm, and alternatively greater than 0 to 100 μm.

If desired, the film may be subjected to further processing depending upon its end use application. For example, the film may be subjected to oxide deposition (e.g. SiO₂ deposition), resist deposition and patterning, etching, chemical, corona, or plasma stripping, metallization, or metal deposition. Such further processing techniques are generally known. Such deposition may be chemical vapor deposition (including low-pressure chemical vapor deposition, plasma-enhanced chemical vapor deposition, and plasma-assisted chemical vapor deposition), physical vapor deposition, or other vacuum deposition techniques. Many such further processing techniques involve elevated temperatures, particularly vacuum deposition, for which the film is well suited in view of its excellent thermal stability. Depending on an end use of the film, however, the film may be utilized with such further processing.

The coated substrate may be utilized in diverse end use applications. For example, the coated substrate may be utilized in coating applications, packaging applications, adhesive applications, fiber applications, fabric or textile applications, construction applications, transportation applications, electronics applications, or electrical applications. However, the curable composition may be utilized in end use applications other than preparing the coated substrate, e.g. in the preparation of articles, such as silicone rubbers.

Alternatively, the coated substrate may be utilized as a release liner, e.g. for a tape or adhesive, including any pressure-sensitive adhesives, including acrylic resin-type pressure-sensitive adhesives, rubber-type pressure-sensitive adhesives, and silicone-type pressure-sensitive adhesives, as well as acrylic resin-type adhesives, synthetic rubber-type adhesives, silicone-type adhesives, epoxy resin-type adhesives, and polyurethane-type adhesives. Each major surface of the substrate may having a film disposed thereon for double sided tapes or adhesives.

Alternatively, when the curable composition will be formulated as a release coating composition, e.g. for forming a release coating or liner, the release coating composition may be prepared by mixing the components together, for example, to prepare a one part composition. However, it may be desirable to prepare a release coating composition as a multiple part composition, in which components having SiH functionality (e.g., the (C) organosilicon compound) and the (D) hydrosilylation-reaction catalyst are stored in separate parts, until the parts are combined at the time of use (e.g., shortly before application to a substrate). When the curable composition is the release coating composition, the release coating composition can utilized to form the coated substrate as described above, and the release coating is formed by applying and curing the release coating composition on the substrate, e.g. a surface of the substrate.

For example, a multiple part curable composition may comprise:

-   -   Part (A), a base part comprising the (A) reaction product,         the (B) organopolysiloxane including an average of at least two         silicon-bonded ethylenically unsaturated groups per molecule,         and (D) the hydrosilylation-reaction catalyst, and optionally         when present, one or more of, the (F) anchorage additive, and         the (I) vehicle, and     -   Part (B), a curing agent part comprising the (C) organosilicon         compound having an average, per molecule, of at least two         silicon bonded hydrogen atoms per molecule, and optionally when         present, the (F) anchorage additive and/or the (I) vehicle. When         utilized, the (E) inhibitor may be added to either Part (A),         Part (B), or both. Part (A) and Part (B) may be combined in a         weight ratio (A):(B) of 1:1 to 30:1, alternatively 1:1 to 10:1,         alternatively 1:1 to 5:1, and alternatively 1:1 to 2:1. Part (A)         and Part (B) may be provided in a kit with instructions, e.g.,         for how to combine the parts to prepare the release coating         composition, how to apply the release coating composition to a         substrate, and how to cure the release coating composition.

Alternatively, when the (F) anchorage additive is present, it can be incorporated in either of Part (A) or Part (B), or it can be added in a separate (third) part.

The release coating composition can for example be applied to the substrate by any convenient means such as spraying, doctor blade, dipping, screen printing or by a roll coater, e.g. an offset web coater, kiss coater or etched cylinder coater.

The release coating composition of the invention can be applied to any substrate, such as those described above. Alternatively, the release coating composition may be applied to polymer film substrates, for example polyester, particularly polyethylene terephthalate (PET), polyethylene, polypropylene, or polystyrene films. The release coating composition can alternatively be applied to a paper substrate, including plastic coated paper, for example paper coated with polyethylene, glassine, super calender paper, or clay coated kraft. The release coating composition can alternatively be applied to a metal foil substrate, for example aluminum foil.

In certain embodiments, the method of preparing the coated substrate may further comprise treating the substrate before applying or disposing the release coating composition on the substrate. Treating the substrate may be performed by any convenient means such as a plasma treatment or a corona discharge treatment. Alternatively, the substrate may be treated by applying a primer. In certain instances, anchorage of the release coating may be improved if the substrate is treated before forming the release coating thereon from the release coating composition.

When the release coating composition includes the (I) vehicle, the method may further comprise removing the (I) vehicle, which may be performed by any conventional means, such as heating at 50° C. to 100° C. for a time sufficient to remove all or a portion of the (I) vehicle. The method may further comprise curing the release coating composition to form the release coating on a surface of the substrate. Curing may be performed by any conventional means such as heating at 100° C. to 200° C.

Under production coater conditions, cure can be effected in a residence time of 1 second to 6 seconds, alternatively 1.5 seconds to 3 seconds, at an air temperature of 120° C. to 150° C. Heating can be performed in an oven, e.g., an air circulation oven or tunnel furnace or by passing the coated film around heated cylinders.

The following examples are intended to illustrate the invention and are not to be viewed in any way as limiting to the scope of the invention. Certain components utilized in the Examples are set forth in Table 1 below, followed by characterization and evaluation procedures also used in the Examples.

TABLE 1 Components Component Chemical Description Branched Vinyl-functional M_(x)DQ (x > 1) of formula M^(Vi) _(1.69n)M^(OZ) _(0.32n) Organopolysiloxane D_(358.61n)Q_(1.00n), where n > 1 such that Component (A1-1) (A1-1) includes more than one Q siloxy unit, and where Z is independently alkyl or H Branched M^(Vi) _(2.47n)M^(OZ) _(0.19n)D_(434.73n)Q_(1.00n) (n > 1) ,where n > 1 such Organopolysiloxane that Component (A1-2) includes more than one Q siloxy unit, and (A1-2) where Z is independently alkyl or H. Organosiloxane HMe₂Si-terminated polydimethylsiloxane M^(H)D₁₀₀M^(H) Compound (A2-1) Organosiloxane HMe₂Si-terminated polydimethylsiloxane M^(H)D₄₀M^(H) Compound (A2-2) Organosiloxane Dumbbell-shaped compound of formula: Compound (A2-3)

where n = 10 and each o is from 2-4. Organosiloxane M^(H) _(1.94n)(D^(OH))_(0.034n)(Q^(OH))_(0.034n)(Q^(OEt))_(0.094n)(Q)_(1n), where Compound (A2-4) n > 1 such that Component (A2-4) includes more than one Q siloxy unit, and where Et is ethyl. Organopolysiloxane (B-1) Vinyl end-blocked Q-branched polymer of formula: M^(Vi) ₄D₂₂₇Q (M^(Vi) _(4.6)D₂₈₉Q by ²⁹Si-NMR) Organopolysiloxane (B-2) Vinyl end-blocked Q-branched polymer of formula: M^(Vi) ₄D₂₈₀Q Organopolysiloxane (B-3) Vinyl end-blocked Q-branched polymer of formula: M^(Vi) ₄D₁₂₀Q Catalyst (D1) Karstedt's catalyst Inhibitor (E1) Ethynyl cyclohexanol Inhibitor (E2) 3,5-Dimethyl-1-hexyn-3-ol Solvent 1 Toluene (C₇H₈) Solvent 2 Methanol (CH₃OH) Organosilicon Compound Me₃Si-terminated methylhydrogen homopolymer MD^(Me,H) ₂₅M (C1) Organosilicon Compound Me₃Si-terminated dimethyl methylhydrogen copolymer (C2) MD^(Me2) ₁₈D^(Me,H) ₄₂M Organosilicon Compound Blend of Me₃Si-terminated dimethyl methylhydrogen copolymer (C3) MD^(Me2) ₁₈D^(Me,H) ₄₂M and Me₃Si-terminated methylhydrogen homopolymer MD^(Me,H) ₄₀M Nuclear Magnetic Resonance Spectroscopy (NMR)

Nuclear magnetic resonance (NMR) spectra are obtained on a NMR BRUKER AVIII (400 MHz), using a silicon-free 10 mm tube and CDCl₃/Cr(AcAc)₃ solvent. Chemical shifts for ²⁹Si-NMR spectra are referenced to internal solvent resonance and are reported relative to tetramethylsilane.

Gel Permeation Chromatography (GPC)

Gel permeation chromatography (GPC) analysis is conducted on an Agilent 1260 Infinity II chromatograph equipped with a triple detector composed of a differential refractometer, an online differential viscometer, a low angle light scattering (LALS: 15° and 90° angles of detection), and a column (2 PL Gel Mixed C, Varian). Toluene (HPLC grade, Biosolve) is used as mobile phase, at a flow rate of 1 mL/min.

X-Ray Fluorescence (XRF)

X-Ray Fluorescence (XRF) is conducted on an Oxford Instruments Lab-X 3500 Benchtop XRF analyzer.

Mist Level Evaluation (MLE)

Mist evaluation is conducted using a mist evaluation system including a custom-built 2-roll coater disposed in an enclosed chamber equipped with a ventilation system. The coater includes a top roll (chrome) arranged in a stacked configuration over a rubber bottom roll (neoprene), which is arranged over a sample pan and driven by a motor (rotation of 1000 meters per minute, during operation). Each roll is 6 inches in diameter and 12 inches wide. The ventilation system is configured to draw air to a back wall of the enclosure, and includes a magnehelic gauge positioned at the ceiling of the enclosure to measure/monitor air flow (rate of 0.20-0.25 inches of water (i.e., 0.05-0.062 kPa), at the magnehelic gauge), two mist collection pipes positioned above the center of the top roll (6 inches) of the coater to collect mist, and an aerosol monitor (DustTrak 8530, recording mist level every 5 seconds) connected to each mist collection pipe.

A sample (600 g) is disposed into the sample pan, which is inserted below the bottom roll to be picked up and transferred to the top roll as a film. The coater is operated for 6 minutes, and mist generated therefrom collected by the mist collection pipes and measured by the aerosol monitor. Mist levels obtained between 120 s to 360 s are averaged and reported at a mist value for the sample.

Mist Level and Cure performance Industrial Evaluation (MLIE)

Mist evaluation and cure performance evaluation are conducted on an industrial pilot line based on a 6-roll coating head where the five rollers are in a stacked configuration of alternating chrome steel and rubber sleeved rolls with the first bottom two rolls horizontally aligned together to form a ‘nip’ where the coating bath is held, and the remaining rolls aligned vertically to allow transfer from one roll to the next until the coating is finally transferred to the paper surface at the ‘nip’ between the top two rolls. Each of the rolls are pressed together using independent pressure settings and each is driven by a different motor set to a different speed so that there is a stepwise reduction in the coating thickness until the coating is finally applied to the paper surface. A mist collection fixed pipe is located less than 20 cm from the front outside nip of the final 2 coating rollers and is connected to an aerosol monitor Dustrak 8530. The final top 2 rollers are set to rotate at speeds close to the desired speed, such as 1,000 m/min during the mist evaluation period during which the mist levels are recorded and averaged to be reported as mist values in mg/m³. The cure performance of the release coating formulations was evaluated by extractable percentage test described below.

Cure Performance: Extractable Percentage

Cure performance of a sample composition is evaluated by determining an extractable percent value (extractable %). In particular, a sample composition is coated and cured on a substrate (Glassine paper) to form a coated substrate, which is immediately cut into three sample discs (die cutter, 1.375 inch (3.49 cm)) handled only by tweezers to minimize contamination and/or damage. Each sample disc is analyzed via XRF to determine an initial coat weight (W^(i) _(s)) before being placed in an individual bottle (100-mL, covered with a lid) containing solvent (methyl isobutyl ketone, 40 mL) and allowed to rest on a bench to soak for 30 minutes. Each sample disc is then removed from the bottle, placed coated-side-up on a clean surface (tissue paper) to allow residual solvent to evaporate (without blotting/wiping), and analyzed via XRF to determine a final coat weight (W^(f) _(s)). The extractable % of each sample is the percent change in coat weight from the solvent soak, i.e., is calculated using the formula: [(W^(i) _(s)−W^(f) _(s))/Wi]×100%). The extractable % indicates the amount of non-cured components of the sample composition (e.g. non-crosslinked silicone) extractable from the coated substrate, such as a lower extractable % indicates a higher/better cure performance.

Cure Performance: Anchorage (ROR %)

The anchorage of a sample composition is evaluated via anchorage index, i.e., by determining a percent rub-off resistance (ROR %) value. In particular, a sample composition is coated and cured on a substrate (Glassine paper) to form a coated substrate. Immediately following cure, the coated substrate is cut into two sample discs (die cutter, 1.375 inch (3.49 cm)), which are each analyzed via XRF to determine an initial coat weight (W^(i) _(a)). Each sample disc is then abraded with a felt under load (1.9 kg) using automated abrading equipment, in a method similar to a Taber-type abrasion test (e.g. such as that of ASTM D4060-19, “Standard Test Method for Abrasion Resistance of Organic Coatings by the Taber Abraser”), and subsequently analyzed via XRF to determine a final coat weight (W^(f) _(a)). The ROR % of each sample is calculated using the formula: [W^(f) _(s)/W^(i) _(s)]×100%). The ROR % indicates how strong the coating is anchored to the substrate, such that a higher ROR % indicates a higher/better anchorage the higher the ROR % value the better.

Preparation Examples 1-15

Table 2 below shows the identification and amounts of components utilized in Preparation Examples 1-15, involving the preparation of the (A) reaction product of: (1) the branched organopolysiloxane and (2) the organosilicon compound. In each of Preparation Examples 1-15, the (A1) branched organopolysiloxane and the particular (A2) organosilicon compound were mixed well in a plastic bottle vigorously via a mechanical stirrer to give a mixture. The (D1) catalyst was disposed in Solvent 1 to give a catalyst solution. The catalyst solution was slowly added to the mixture under vigorous stirring at room temperature to give a reaction mixture. The reaction mixture was stirred for 20 minutes and kept at 40° C. in a vented oven for 12 hours. A clear homogenous viscous flowable product was obtained in 100% yield for each of Preparation Examples 1-15.

TABLE 2 Preparation Molar Example (A1-1) (A1-2) (A2-1) (A2-2) (A2-3) (A2-4) Ratio (D1) No. grams grams grams grams grams grams Vi:SiH grams 1 710.28 0 40.43 0 0 0 4 1.64 2 582.53 0 26.23 0 0 0 5 1.33 3 684.96 0 19.5 0 0 0 8 1.53 4 641.58 0 14.61 0 0 0 10 1.43 5 735.78 0 0 5.19 0 0 5 1.61 6 700.08 0 0 2.47 0 0 10 1.53 7 722.78 0 0 1.27 0 0 20 1.58 8 714.54 0 46.59 0 0 0 3.5 1.66 9 750.10 0 53.38 0 0 0 3.2 1.75 10 696.82 0 0 6.14 0 0 5 1.53 11 700.83 0 53.2 0 0 0 3.0 1.64 12 715.18 0 0 7.20 0 0 3.5 1.57 13 78.85 0 0 0 0.10 0 10 0.17 14 88.42 0 0 0 0 0.05 10 0.19 15 0 79.87 2.83 0 0 0 10 0.18

Table 3 below show the average formula for each of the reaction products prepared in Preparation Examples 1-15, where available, via ²⁹Si-NMR. In Table 3, M^(CH2CH2) indicates M siloxy units including a silicon-bonded ethylene group from the silicon-bonded vinyl group of the (A1) branched organopolysiloxane reacting with the silicon-bonded hydrogen atom of the particular (A2) organosilicon compound. M^(Vi) indicates M siloxy units including a silicon-bonded vinyl group from the (A1) branched organopolysiloxane which did not react with a silicon-bonded hydrogen atom of the particular (A2) organosilicon compound. M^(OZ) indicates an M siloxy unit including a silicon-bonded hydroxyl or alkoxy group (where Z is H or alkyl), which was likely present in the (A1) branched organopolysiloxane from its formation and remains in the reaction product. D indicates dimethylsiloxy units.

TABLE 3 Reaction Product of Molar Ratio of M^(CH2CH2)/M^(Vi)/M^(OZ)/D/Q siloxy Preparation Example: units with Q siloxy units normalized to 1 1 0.71/1.29/0.13/352.43/1 2 0.43/1.47/0.17/394.79/1 3 0.31/1.67/0.18/420.05/1 4 0.22/1.80/0.11/467.83/1 5 0.59/1.33/0.08/335.04/1 6 0.19/1.21/0.03/319.08/1 7 0.20/1.32/0.05/316.06/1 8 0.82/1.33/0.13/364.71/1 10 0.53/1.42/0.01/419.27/1 12 0.21/1.54/0/413.63/1 13 0.64/1.71/0/483.20/1 14 0.71/1.51/0.17/338.63/1

Examples 1-11 & Comparative Examples 1-3: Base Compositions

Various Base Compositions for forming release coatings are prepared. Examples 1-11 include the (A) reaction products prepared in Preparation Examples 1-10. The (A) reaction product from Preparation Example 1 is referred to in Table 4 below as P.E.1. The (A) reaction product from Preparation 2 is referred to in Table 4 below as P.E.2, and so on. In Table 4, C.E. indicates a Comparative Example. All values in Table 4 below are in grams.

TABLE 4 P.E. P.E. P.E. P.E. P.E. P.E. P.E. P.E. P.E. Ex. (B-1) (A1-1) 1 2. 3 4 5 6 7 8 10 1 588.00 0 12.00 0 0 0 0 0 0 0 0 2 588.00 0 0 12.00 0 0 0 0 0 0 0 3 588.00 0 0 0 12.00 0 0 0 0 0 0 4 588.00 0 0 0 0 12.00 0 0 0 0 0 5 588.00 0 0 0 0 0 12.00 0 0 0 0 6 588.00 0 0 0 0 0 0 12.00 0 0 0 7 588.00 0 0 0 0 0 0 0 12.00 0 0 8 588.00 0 0 0 0 0 0 0 0 12.00 0 9 588.00 0 0 0 0 0 0 0 0 0 12.00 10 594.00 0 0 0 0 0 0 0 0 6.00 0 11 594.00 0 0 0 0 0 0 0 0 0 6.00 C.E 600.00 0 0 0 0 0 0 0 0 0 0 1 C.E 594.00 6.00 0 0 0 0 0 0 0 0 0 2 C.E 588.00 12.00 0 0 0 0 0 0 0 0 0 3

Table 5 shows the mist level evaluation (MLE) for each of the base compositions of Examples 1-11 and Comparative Examples 1-3 as measured in accordance with the procedure described above.

TABLE 5 Example Mist No. (mg/m3) 1 2.58 2 3.08 3 5.24 4 4.95 5 3.98 6 5.79 7 7.44 8 2.50 9 2.52 10 4.35 11 4.35 C.E. 1 175.4 C.E. 2 15.95 C.E. 3 8.25

Examples 12-15 & Comparative Examples 4-5: Coated Substrates

Curable compositions are prepared and utilized to prepare coated substrates. In particular, each curable composition is coated onto a substrate (glassine paper) and cured (exit web oven temperature: 182° C.; dwell time: 10 s) to form a coated substrate by using a pilot coater (G-001, Milliken Engineering INC), samples of which are evaluated for immediate extractable %, and immediate ROR %. Table 6 below shows the components and relative amounts thereof to form the curable compositions of Examples 12-15 and Comparative Examples 4-5. In each of the curable compositions of Examples 12-15 and Comparative Examples 4-5, the platinum content is 60 ppm based on (D1), the molar ratio of (E1) to platinum content is 40:1, and the molar ratio of SiH to Vi is 2:1.

TABLE 6 Ex. (B-1) P.E. 1 P.E. 2 (D1) (E1) (C1) (C2) 12 93.65 2.00 0 1.15 0.15 3.05 0 13 92.40 2.00 0 1.15 0.15 0 4.30 14 93.65 0 2.00 1.15 0.15 3.05 0 15 92.40 0 2.00 1.15 0.15 0 4.30 C.E. 4 95.59 0 0 1.15 0.15 3.10 0 C.E. 5 94.32 0 0 1.15 0.15 0 4.37

Table 7 below shows the physical properties associated with the coated substrates formed with Examples 12-15 and Comparative Examples 4-5. The 7 day release force (7dRF) was measured at various speeds, namely at 0.3 m/min (MPM), 10 m/min (MPM), 100 m/min (MPM), and 300 m/min (MPM). The 7dRF was tested via an Imass SP-2100 and ZPE-1100W release test system after lamination with Tesa 7475 standard tape aged for seven days under 40 lbs at RT and 50% RH.

TABLE 7 Property: 12 13 14 15 C.E. 4 C.E. 5 Extractable 2.56 0.41 0.00 0.00 0.40 0.00 % (%): ROR % (%): 94.46 96.94 95.67 91.83 96.64 96.77 7dRF 0.3 MPM 30.33 46.23 85.33 46.87 27.80 41.43 (g/inch): 7dRF 10 MPM 61.57 82.04 66.93 80.94 69.06 75.28 (g/inch): 7dRF 100 MPM 124.08 136.62 120.38 141.19 112.05 131.14 (g/inch): 7dRF 300 MPM 87.40 106.12 87.13 107.45 73.33 102.63 (g/inch):

Examples 16-21 & Comparative Examples 6-7: Coated Substrates

Curable compositions are prepared and utilized to prepare coated substrates. In particular, each curable composition is coated onto a substrate in accordance with the process described above for the Mist Level and Cure Performance Industrial Evaluation (MLIE). Table 8 below shows the components and relative amounts thereof to form the curable compositions of Examples 16-21 and Comparative Examples 6-7. Examples 16-21 include the (A) reaction products obtained in Preparation Examples 1, 8, 9, or 10. The (A) reaction product from Preparation Example 8 is referred to P.E.8 in Table 8 below. The (A) reaction product from Preparation 10 is referred to P.E. 10 in Table 8 below, and so on. In Table 8, C.E. indicates a Comparative Example. All values in Table 8 below are in grams.

TABLE 8 Line speed (A1-1) (B-1) (B-2) (C3) (D1) (E1) Ex. (m/min) (g) (g) (g) (g) (g) (g) 16 1000 0 7980 0 285.29 115.44 20 17 1000 0 7980 0 285.29 114.25 20 18 1000 0 7980 0 285.29 115.44 20 19 1000 0 7980 0 285.29 115.44 20 20 1000 0 7980 0 284.36 115.44 20 21 1300 0 0 7623.89 254.86 115.44 11.5 C.E. 1000 171.44 7980 0 285.29 114.25 20  6 C.E. 1000 84.83 7980 0 284.36 109.8 20  7 16 1000 0 171.44 0 0 17 1000 0 0 0 171.44 18 1000 171.44 0 0 0 19 1000 0 0 171.44 0 20 1000 0 0 84.83 0 21 1300 0 0 81 0 C.E. 1000 0 0 0 0  6 C.E. 1000 0 0 0 0  7

Table 9 shows the mist level industrial evaluation (MLIE) values and cure performance (extractable %) as measured at different line speed in accordance with the procedure described above for each of Examples 16-21 and Comparative Examples 6-7.

TABLE 9 Line speed Extractable Average Mist Ex. (m/min) (%) level (mg/m³) 16 1000 3.44 1.92 17 1000 2.13 1.34 18 1000 0.62 1.97 19 1000 1.66 2.04 20 1000 3.93 2.90 21 1300 2.90 2.53 C.E. 6 1000 1.30 8.76 C.E. 7 1000 5.40 15.20

Definitions and Usage of Terms

Abbreviations used in the specification have the definitions in Table 8, below.

TABLE 8 Abbreviations Abbreviation Definition cP centiPose d day Da Daltons DP degree of polymerization FTIR Fourier Transfer Infra-Red g grams GC gas chromatography GPC gel permeation chromatography HPLC high performance liquid chromatography Me methyl mg milligrams MHz megaHertz mL milliliters mm millimeters Mn number average molecular weight as measured by GPC Mp Peak molecular weight as measured by GPC mPa · s milli-Pascal seconds MS mass spectroscopy Mw weight average molecular weight Mz Z-average molecular weight NMR nuclear magnetic resonance O.D. outer diameter PD polydispersity Ph phenyl ppm parts per million PTFE polytetrafluoroethylene RH relative humidity RT room temperature of 25° C. s seconds SiH content hydrogen, as silicon bonded hydrogen, as measured by 29 Si NMR THF tetrahydrofuran μL microliter μm micrometer Vi vinyl

All amounts, ratios, and percentages are by weight unless otherwise indicated. The amounts of all starting materials in a composition total 100% by weight. The SUMMARY and ABSTRACT are hereby incorporated by reference. The articles ‘a’, ‘an’, and ‘the’ each refer to one or more, unless otherwise indicated by the context of specification. The singular includes the plural unless otherwise indicated. The disclosure of ranges includes the range itself and also anything subsumed therein, as well as endpoints. For example, disclosure of a range of 2.0 to 4.0 includes not only the range of 2.0 to 4.0, but also 2.1, 2.3, 3.4, 3.5, and 4.0 individually, as well as any other number subsumed in the range. Furthermore, disclosure of a range of, for example, 2.0 to 4.0 includes the subsets of, for example, 2.1 to 3.5, 2.3 to 3.4, 2.6 to 3.7, and 3.8 to 4.0, as well as any other subset subsumed in the range. Similarly, the disclosure of Markush groups includes the entire group and also any individual members and subgroups subsumed therein. For example, disclosure of the Markush group a hydrogen atom, an alkyl group, an alkenyl group, or an aryl group, includes the member alkyl individually; the subgroup alkyl and aryl; and any other individual member and subgroup subsumed therein.

“Alkyl” means a branched or unbranched, saturated monovalent hydrocarbon group. Examples of alkyl groups include methyl, ethyl, propyl (including n-propyl and/or iso-propyl), butyl (including iso-butyl, n-butyl, tert-butyl, and/or sec-butyl), pentyl (including, iso-pentyl, neopentyl, and/or tert-pentyl); and n-hexyl, n-heptyl, n-octyl, n-nonyl, and n-decyl, as well as branched saturated monovalent hydrocarbon groups of 6 or more carbon atoms. Alkyl groups have at least one carbon atom. Alternatively, alkyl groups may have 1 to 18 carbon atoms, alternatively 1 to 12 carbon atoms, alternatively 1 to 6 carbon atoms, alternatively 1 to 4 carbon atoms, alternatively 1 to 2 carbon atoms, and alternatively 1 carbon atom.

“Aralkyl” and “alkaryl” each refer to an alkyl group having a pendant and/or terminal aryl group or an aryl group having a pendant alkyl group. Exemplary aralkyl groups include benzyl, tolyl, xylyl, dimethyl phenyl, phenylmethyl, phenylethyl, phenyl propyl, and phenyl butyl. Aralkyl groups have at least 7 carbon atoms. Monocyclic aralkyl groups may have 7 to 12 carbon atoms, alternatively 7 to 9 carbon atoms, and alternatively 7 to 8 carbon atoms. Polycyclic aralkyl groups may have 7 to 17 carbon atoms, alternatively 7 to 14 carbon atoms, and alternatively 9 to 10 carbon atoms.

“Alkenyl” means a branched, or unbranched monovalent hydrocarbon group, where the monovalent hydrocarbon group has a double bond. Alkenyl groups include vinyl, allyl, and hexenyl. Alkenyl groups have at least 2 carbon atoms. Alternatively, alkenyl groups may have 2 to 12 carbon atoms, alternatively 2 to 10 carbon atoms, alternatively 2 to 6 carbon atoms, alternatively 2 to 4 carbon atoms, and alternatively 2 carbon atoms.

“Alkynyl” means a branched, or unbranched monovalent hydrocarbon group, where the monovalent hydrocarbon group has a triple bond. Alkynyl groups include ethynyl and propynyl. Alkynyl groups have at least 2 carbon atoms. Alternatively, alkynyl groups may have 2 to 12 carbon atoms, alternatively 2 to 10 carbon atoms, alternatively 2 to 6 carbon atoms, alternatively 2 to 4 carbon atoms, and alternatively 2 carbon atoms.

“Aryl” means a hydrocarbon group derived from an arene by removal of a hydrogen atom from a ring carbon atom. Aryl is exemplified by, but not limited to, phenyl and naphthyl. Aryl groups have at least 5 carbon atoms. Monocyclic aryl groups may have 5 to 9 carbon atoms, alternatively 6 to 7 carbon atoms, and alternatively 6 carbon atoms. Polycyclic aryl groups may have 10 to 17 carbon atoms, alternatively 10 to 14 carbon atoms, and alternatively 12 to 14 carbon atoms.

“Carbocycle” and “carbocyclic” refer to a hydrocarbon ring. Carbocycles may be monocyclic or polycyclic, e.g., bicyclic or with more than two rings. Bicyclic carbocycles may be fused, bridged, or spiro polycyclic rings. Carbocycles have at least 3 carbon atoms. Monocyclic carbocycles may have 3 to 9 carbon atoms, alternatively 4 to 7 carbon atoms, and alternatively 5 to 6 carbon atoms. Polycyclic carbocycles may have 7 to 17 carbon atoms, alternatively 7 to 14 carbon atoms, and alternatively 9 to 10 carbon atoms. Carbocycles may be saturated (e.g., cyclopentane or cyclohexane), partially unsaturated (e.g., cyclopentene or cyclohexene), or fully unsaturated (e.g., cyclopentadiene or cycloheptatriene).

“Cycloalkyl” refers to a saturated hydrocarbon group including a carbocycle. Cycloalkyl groups are exemplified by cyclobutyl, cyclopentyl, cyclohexyl, and methylcyclohexyl. Cycloalkyl groups have at least 3 carbon atoms. Monocyclic cycloalkyl groups may have 3 to 9 carbon atoms, alternatively 4 to 7 carbon atoms, and alternatively 5 to 6 carbon atoms. Polycyclic cycloalkyl groups may have 7 to 17 carbon atoms, alternatively 7 to 14 carbon atoms, and alternatively 9 to 10 carbon atoms.

“Monovalent hydrocarbon group” means a univalent group made up of hydrogen and carbon atoms. Monovalent hydrocarbon groups include alkyl, aralkyl, alkenyl, alkynyl, and cycloalkyl groups as defined above.

“Monovalent halogenated hydrocarbon group” means a monovalent hydrocarbon group where one or more hydrogen atoms bonded to a carbon atom have been formally replaced with a halogen atom. Halogenated hydrocarbon groups include haloalkyl groups, halogenated carbocyclic groups, and haloalkenyl groups. Halogenated alkyl groups (or haloalkyl groups) include the alkyl groups or cycloalkyl groups described above where one or more of the hydrogen atoms is replaced with a halogen atom, such as F or Cl. Haloalkyl groups include fluorinated alkyl groups and fluorinated cycloalkyl groups such as trifluoromethyl (CF₃), fluoromethyl, trifluoroethyl, 2-fluoropropyl, 3,3,3-trifluoropropyl, 4,4,4-trifluorobutyl, 4,4,4,3,3-pentafluorobutyl, 5,5,5,4,4,3,3-heptafluoropentyl, 6,6,6,5,5,4,4,3,3-nonafluorohexyl, 8,8,8,7,7-pentafluorooctyl, 2,2-difluorocyclopropyl, 2,3-difluorocyclobutyl, 3,4-difluorocyclohexyl, and 3,4-difluoro-5-methylcycloheptyl; and chlorinated alkyl and chlorinated cycloalkyl groups such as chloromethyl, 3-chloropropyl 2,2-dichlorocyclopropyl, 2,3-dichlorocyclopentyl. Haloalkenyl groups include chloroallyl. Halogenated aryl groups include chlorobenzyl and fluorobenzyl.

The term “comprising” and derivatives thereof, such as “comprise” and “comprises” are used herein in their broadest sense to mean and encompass the notions of “including,” “include,” “consist(ing) essentially of,” and “consist(ing) of. The use of “for example,” “e.g.,” “such as,” and “including” to list illustrative examples does not limit to only the listed examples. Thus, “for example” or “such as” means “for example, but not limited to” or “such as, but not limited to” and encompasses other similar or equivalent examples.

Generally, as used herein a hyphen “-” or dash “—” in a range of values is “to” or “through”; a “>” is “above” or “greater-than”; a “≥” is “at least” or “greater-than or equal to”; a “<” is “below” or “less-than”; and a “≤” is “at most” or “less-than or equal to.” On an individual basis, each of the aforementioned applications for patent, patents, and/or patent application publications, is expressly incorporated herein by reference in its entirety in one or more non-limiting embodiments.

It is to be understood that the appended claims are not limited to express and particular compounds, compositions, or methods described in the detailed description, which may vary between particular embodiments which fall within the scope of the appended claims. 

What is claimed is:
 1. A composition for forming a release coating, said composition comprising: (A) the reaction product of: (1) a branched organopolysiloxane having the formula (R¹ _(y)R² _(3-y)SiO_(1/2))_(x)(R¹ ₂SiO_(2/2))_(z)(SiO_(4/2))_(1.0)(ZO_(1/2))_(w) wherein each R¹ is an independently selected hydrocarbyl group having from 1 to 32 carbon atoms, with the proviso that an average of at least two of R¹ in each molecule are independently ethylenically unsaturated groups; each R² is independently selected from R¹, an alkoxy group, and a hydroxyl group; Z is independently H or an alkyl group; y is an integer from 1 to 3 and is independently selected in each siloxy unit indicated by subscript x; subscript x is from 0.05 to 4; subscript z is from 10 to 3,000; and subscript w is from 0 to 3; and (2) an organosilicon compound having an average of at least two silicon-bonded hydrogen atoms per molecule; in the presence of a hydrosilylation catalyst; and (B) an organopolysiloxane having an average of at least two silicon-bonded ethylenically unsaturated groups per molecule; wherein component (A) is formed with a molar excess of silicon-bonded ethylenically unsaturated groups in component (A)(1) to silicon-bonded hydrogen atoms in component (A)(2) such that the (A) reaction product is only partially crosslinked.
 2. The composition of claim 1, wherein the (A)(1) branched organopolysiloxane is the reaction product of: (i) a silicone resin having the formula (R¹ _(y)R² _(3-y)SiO_(1/2))_(x)(SiO_(4/2))_(1.0)(ZO_(1/2))_(w), wherein each R¹ is an independently selected and defined above; each R² is independently selected and defined above; each Z is independently selected and defined above; y is independently selected in each siloxy unit indicated by subscript x and defined above; subscript x is defined above; and subscript w is defined above; and (ii) a cyclic siloxane having the formula (R¹ ₂SiO_(2/2))_(n), where each R¹ is independently a hydrocarbyl group, and n is an integer from 3 to 15; in the presence of a polymerization catalyst.
 3. The composition of claim 1, wherein the (A)(2) organosilicon compound: (i) is a cyclic siloxane having an average of at least two silicon-bonded hydrogen atoms per molecule; or (ii) has the formula H_(y′)R¹ _(3-y′)Si—(OSiR¹ ₂)_(m)—(OSiR¹H)_(m′)—OSiR¹ _(3-y′)H_(y′), where each R¹ is independently selected and defined above, each y′ is independently selected from 0 or 1, subscripts m and m′ are each from 0 to 1,000 with the proviso that m and m′ are not simultaneously 0 and m+m′ is from 1 to 1,000.
 4. The composition of claim 1, wherein the (A) reaction product comprises a moiety having the following structure:

wherein each R¹ is independently selected and defined above; subscripts a, a′, b, and b′ are each greater than 0, with the proviso that a+b is from 0.05 to 4 and a′+b′ is from 0.05 to 4; subscript c is from 100 to 3,000; subscript c′ is from 100 to 3,000; each D is an independently selected alkylene group, and subscript X is a siloxane moiety.
 5. The composition of claim 1, wherein: (i) each R¹ is an independently selected alkyl group or alkenyl group; (ii) subscript y is 3; or (iii) both (i) and (ii).
 6. The composition of claim 2, wherein the polymerization catalyst comprises a phosphazene base catalyst.
 7. The composition of claim 1, wherein the (B) organopolysiloxane: (i) is a linear or branched organopolysiloxane including the silicon-bonded ethylenically unsaturated groups in at least one M siloxy unit; or (ii) has the formula (R³ _(y)R¹ _(3-y)SiO_(1/2))_(x′)(R¹ ₂SiO_(2/2))_(z′)(SiO_(4/2))_(1.0)(ZO_(1/2))_(w), where each R³ is an independently selected ethylenically unsaturated group, subscript y is independently selected in each siloxy unit indicated by subscript x′; each R¹ is independently selected and defined above; subscript x′ is from 1.5 to 4; Z is independently elected and defined above; subscript w is from 0 to 3; and subscript z′ is from 3 to 1,000.
 8. The composition of claim 1, further comprising a hydrosilylation-reaction inhibitor.
 9. The composition of claim 1, further comprising: (C) an organosilicon compound including an average of at least two silicon-bonded hydrogen atoms per molecule; and (D) a hydrosilylation catalyst.
 10. The composition of claim 9, wherein: (i) the (C) organosilicon compound comprises an organohydrogensiloxane; (ii) the molar ratio of SiH to silicon-bonded ethylenically unsaturated groups is from 1:1 to 5:1; or (iii) both (i) and (ii).
 11. The composition of claim 1, comprising the (A) reaction product in an amount of from greater than 0 to 10 weight percent based on the total weight of the composition.
 12. The composition of claim 1, comprising the (B) organopolysiloxane in an amount of from 60 to 99.5 weight percent based on the total weight of the composition.
 13. A method of preparing the composition of claim 1, said method comprising combining the (A) reaction product and the (B) organopolysiloxane to give the composition.
 14. A method of forming a coated substrate, said method comprising: applying a composition on a substrate; and curing the composition to give a release coating on the substrate, thereby forming the coated substrate; wherein the composition is the composition of claim
 9. 15. The method of claim 14, wherein the substrate comprises cellulose and/or a polymer.
 16. A coated substrate comprising a release coating disposed on a substrate formed in accordance with the method of claim
 14. 17. The composition of claim 1, wherein the (A) reaction product comprises a plurality of Q siloxy units clustered together. 